diff --git a/tests/test_external_account.py b/tests/test_external_account.py
index df6174f..97f1564 100644
--- a/tests/test_external_account.py
+++ b/tests/test_external_account.py
@@ -37,6 +37,33 @@
     "//iam.googleapis.com/locations/eu/workforcePools/pool-id/providers/provider-id",
     "//iam.googleapis.com/locations/eu/workforcePools/workloadIdentityPools/providers/provider-id",
 ]
+# Workload identity pool audiences or invalid workforce pool audiences.
+TEST_NON_USER_AUDIENCES = [
+    # Legacy K8s audience format.
+    "identitynamespace:1f12345:my_provider",
+    (
+        "//iam.googleapis.com/projects/123456/locations/"
+        "global/workloadIdentityPools/pool-id/providers/"
+        "provider-id"
+    ),
+    (
+        "//iam.googleapis.com/projects/123456/locations/"
+        "eu/workloadIdentityPools/pool-id/providers/"
+        "provider-id"
+    ),
+    # Pool ID with workforcePools string.
+    (
+        "//iam.googleapis.com/projects/123456/locations/"
+        "global/workloadIdentityPools/workforcePools/providers/"
+        "provider-id"
+    ),
+    # Unrealistic / incorrect workforce pool audiences.
+    "//iamgoogleapis.com/locations/eu/workforcePools/pool-id/providers/provider-id",
+    "//iam.googleapiscom/locations/eu/workforcePools/pool-id/providers/provider-id",
+    "//iam.googleapis.com/locations/workforcePools/pool-id/providers/provider-id",
+    "//iam.googleapis.com/locations/eu/workforcePool/pool-id/providers/provider-id",
+    "//iam.googleapis.com/locations//workforcePool/pool-id/providers/provider-id",
+]
 
 
 class CredentialsImpl(external_account.Credentials):
@@ -52,6 +79,7 @@
         quota_project_id=None,
         scopes=None,
         default_scopes=None,
+        workforce_pool_user_project=None,
     ):
         super(CredentialsImpl, self).__init__(
             audience=audience,
@@ -64,6 +92,7 @@
             quota_project_id=quota_project_id,
             scopes=scopes,
             default_scopes=default_scopes,
+            workforce_pool_user_project=workforce_pool_user_project,
         )
         self._counter = 0
 
@@ -83,7 +112,12 @@
         "/locations/global/workloadIdentityPools/{}"
         "/providers/{}"
     ).format(PROJECT_NUMBER, POOL_ID, PROVIDER_ID)
+    WORKFORCE_AUDIENCE = (
+        "//iam.googleapis.com/locations/global/workforcePools/{}/providers/{}"
+    ).format(POOL_ID, PROVIDER_ID)
+    WORKFORCE_POOL_USER_PROJECT = "WORKFORCE_POOL_USER_PROJECT_NUMBER"
     SUBJECT_TOKEN_TYPE = "urn:ietf:params:oauth:token-type:jwt"
+    WORKFORCE_SUBJECT_TOKEN_TYPE = "urn:ietf:params:oauth:token-type:id_token"
     CREDENTIAL_SOURCE = {"file": "/var/run/secrets/goog.id/token"}
     SUCCESS_RESPONSE = {
         "access_token": "ACCESS_TOKEN",
@@ -147,6 +181,31 @@
         )
 
     @classmethod
+    def make_workforce_pool_credentials(
+        cls,
+        client_id=None,
+        client_secret=None,
+        quota_project_id=None,
+        scopes=None,
+        default_scopes=None,
+        service_account_impersonation_url=None,
+        workforce_pool_user_project=None,
+    ):
+        return CredentialsImpl(
+            audience=cls.WORKFORCE_AUDIENCE,
+            subject_token_type=cls.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=cls.TOKEN_URL,
+            service_account_impersonation_url=service_account_impersonation_url,
+            credential_source=cls.CREDENTIAL_SOURCE,
+            client_id=client_id,
+            client_secret=client_secret,
+            quota_project_id=quota_project_id,
+            scopes=scopes,
+            default_scopes=default_scopes,
+            workforce_pool_user_project=workforce_pool_user_project,
+        )
+
+    @classmethod
     def make_mock_request(
         cls,
         status=http.client.OK,
@@ -230,6 +289,21 @@
         assert credentials.requires_scopes
         assert not credentials.quota_project_id
 
+    def test_nonworkforce_with_workforce_pool_user_project(self):
+        with pytest.raises(ValueError) as excinfo:
+            CredentialsImpl(
+                audience=self.AUDIENCE,
+                subject_token_type=self.SUBJECT_TOKEN_TYPE,
+                token_url=self.TOKEN_URL,
+                credential_source=self.CREDENTIAL_SOURCE,
+                workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT,
+            )
+
+        assert excinfo.match(
+            "workforce_pool_user_project should not be set for non-workforce "
+            "pool credentials"
+        )
+
     def test_with_scopes(self):
         credentials = self.make_credentials()
 
@@ -241,6 +315,23 @@
         assert scoped_credentials.has_scopes(["email"])
         assert not scoped_credentials.requires_scopes
 
+    def test_with_scopes_workforce_pool(self):
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        assert not credentials.scopes
+        assert credentials.requires_scopes
+
+        scoped_credentials = credentials.with_scopes(["email"])
+
+        assert scoped_credentials.has_scopes(["email"])
+        assert not scoped_credentials.requires_scopes
+        assert (
+            scoped_credentials.info.get("workforce_pool_user_project")
+            == self.WORKFORCE_POOL_USER_PROJECT
+        )
+
     def test_with_scopes_using_user_and_default_scopes(self):
         credentials = self.make_credentials()
 
@@ -296,6 +387,7 @@
             quota_project_id=self.QUOTA_PROJECT_ID,
             scopes=["email"],
             default_scopes=["default2"],
+            workforce_pool_user_project=None,
         )
 
     def test_with_quota_project(self):
@@ -308,6 +400,22 @@
 
         assert quota_project_creds.quota_project_id == "project-foo"
 
+    def test_with_quota_project_workforce_pool(self):
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        assert not credentials.scopes
+        assert not credentials.quota_project_id
+
+        quota_project_creds = credentials.with_quota_project("project-foo")
+
+        assert quota_project_creds.quota_project_id == "project-foo"
+        assert (
+            quota_project_creds.info.get("workforce_pool_user_project")
+            == self.WORKFORCE_POOL_USER_PROJECT
+        )
+
     def test_with_quota_project_full_options_propagated(self):
         credentials = self.make_credentials(
             client_id=CLIENT_ID,
@@ -336,6 +444,7 @@
             quota_project_id="project-foo",
             scopes=self.SCOPES,
             default_scopes=["default1"],
+            workforce_pool_user_project=None,
         )
 
     def test_with_invalid_impersonation_target_principal(self):
@@ -359,6 +468,20 @@
             "credential_source": self.CREDENTIAL_SOURCE.copy(),
         }
 
+    def test_info_workforce_pool(self):
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        assert credentials.info == {
+            "type": "external_account",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "token_url": self.TOKEN_URL,
+            "credential_source": self.CREDENTIAL_SOURCE.copy(),
+            "workforce_pool_user_project": self.WORKFORCE_POOL_USER_PROJECT,
+        }
+
     def test_info_with_full_options(self):
         credentials = self.make_credentials(
             client_id=CLIENT_ID,
@@ -391,36 +514,7 @@
 
         assert credentials.service_account_email == SERVICE_ACCOUNT_EMAIL
 
-    @pytest.mark.parametrize(
-        "audience",
-        # Workload identity pool audiences or invalid workforce pool audiences.
-        [
-            # Legacy K8s audience format.
-            "identitynamespace:1f12345:my_provider",
-            (
-                "//iam.googleapis.com/projects/123456/locations/"
-                "global/workloadIdentityPools/pool-id/providers/"
-                "provider-id"
-            ),
-            (
-                "//iam.googleapis.com/projects/123456/locations/"
-                "eu/workloadIdentityPools/pool-id/providers/"
-                "provider-id"
-            ),
-            # Pool ID with workforcePools string.
-            (
-                "//iam.googleapis.com/projects/123456/locations/"
-                "global/workloadIdentityPools/workforcePools/providers/"
-                "provider-id"
-            ),
-            # Unrealistic / incorrect workforce pool audiences.
-            "//iamgoogleapis.com/locations/eu/workforcePools/pool-id/providers/provider-id",
-            "//iam.googleapiscom/locations/eu/workforcePools/pool-id/providers/provider-id",
-            "//iam.googleapis.com/locations/workforcePools/pool-id/providers/provider-id",
-            "//iam.googleapis.com/locations/eu/workforcePool/pool-id/providers/provider-id",
-            "//iam.googleapis.com/locations//workforcePool/pool-id/providers/provider-id",
-        ],
-    )
+    @pytest.mark.parametrize("audience", TEST_NON_USER_AUDIENCES)
     def test_is_user_with_non_users(self, audience):
         credentials = CredentialsImpl(
             audience=audience,
@@ -458,6 +552,43 @@
         # not a user.
         assert credentials.is_user is False
 
+    @pytest.mark.parametrize("audience", TEST_NON_USER_AUDIENCES)
+    def test_is_workforce_pool_with_non_users(self, audience):
+        credentials = CredentialsImpl(
+            audience=audience,
+            subject_token_type=self.SUBJECT_TOKEN_TYPE,
+            token_url=self.TOKEN_URL,
+            credential_source=self.CREDENTIAL_SOURCE,
+        )
+
+        assert credentials.is_workforce_pool is False
+
+    @pytest.mark.parametrize("audience", TEST_USER_AUDIENCES)
+    def test_is_workforce_pool_with_users(self, audience):
+        credentials = CredentialsImpl(
+            audience=audience,
+            subject_token_type=self.SUBJECT_TOKEN_TYPE,
+            token_url=self.TOKEN_URL,
+            credential_source=self.CREDENTIAL_SOURCE,
+        )
+
+        assert credentials.is_workforce_pool is True
+
+    @pytest.mark.parametrize("audience", TEST_USER_AUDIENCES)
+    def test_is_workforce_pool_with_users_and_impersonation(self, audience):
+        # Initialize the credentials with workforce audience and service account
+        # impersonation.
+        credentials = CredentialsImpl(
+            audience=audience,
+            subject_token_type=self.SUBJECT_TOKEN_TYPE,
+            token_url=self.TOKEN_URL,
+            credential_source=self.CREDENTIAL_SOURCE,
+            service_account_impersonation_url=self.SERVICE_ACCOUNT_IMPERSONATION_URL,
+        )
+
+        # Even though impersonation is used, is_workforce_pool should still return True.
+        assert credentials.is_workforce_pool is True
+
     @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
     def test_refresh_without_client_auth_success(self, unused_utcnow):
         response = self.SUCCESS_RESPONSE.copy()
@@ -485,6 +616,110 @@
         assert not credentials.expired
         assert credentials.token == response["access_token"]
 
+    @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
+    def test_refresh_workforce_without_client_auth_success(self, unused_utcnow):
+        response = self.SUCCESS_RESPONSE.copy()
+        # Test custom expiration to confirm expiry is set correctly.
+        response["expires_in"] = 2800
+        expected_expiry = datetime.datetime.min + datetime.timedelta(
+            seconds=response["expires_in"]
+        )
+        headers = {"Content-Type": "application/x-www-form-urlencoded"}
+        request_data = {
+            "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "requested_token_type": "urn:ietf:params:oauth:token-type:access_token",
+            "subject_token": "subject_token_0",
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "options": urllib.parse.quote(
+                json.dumps({"userProject": self.WORKFORCE_POOL_USER_PROJECT})
+            ),
+        }
+        request = self.make_mock_request(status=http.client.OK, data=response)
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        credentials.refresh(request)
+
+        self.assert_token_request_kwargs(request.call_args[1], headers, request_data)
+        assert credentials.valid
+        assert credentials.expiry == expected_expiry
+        assert not credentials.expired
+        assert credentials.token == response["access_token"]
+
+    @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
+    def test_refresh_workforce_with_client_auth_success(self, unused_utcnow):
+        response = self.SUCCESS_RESPONSE.copy()
+        # Test custom expiration to confirm expiry is set correctly.
+        response["expires_in"] = 2800
+        expected_expiry = datetime.datetime.min + datetime.timedelta(
+            seconds=response["expires_in"]
+        )
+        headers = {
+            "Content-Type": "application/x-www-form-urlencoded",
+            "Authorization": "Basic {}".format(BASIC_AUTH_ENCODING),
+        }
+        request_data = {
+            "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "requested_token_type": "urn:ietf:params:oauth:token-type:access_token",
+            "subject_token": "subject_token_0",
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+        }
+        request = self.make_mock_request(status=http.client.OK, data=response)
+        # Client Auth will have higher priority over workforce_pool_user_project.
+        credentials = self.make_workforce_pool_credentials(
+            client_id=CLIENT_ID,
+            client_secret=CLIENT_SECRET,
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        credentials.refresh(request)
+
+        self.assert_token_request_kwargs(request.call_args[1], headers, request_data)
+        assert credentials.valid
+        assert credentials.expiry == expected_expiry
+        assert not credentials.expired
+        assert credentials.token == response["access_token"]
+
+    @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
+    def test_refresh_workforce_with_client_auth_and_no_workforce_project_success(
+        self, unused_utcnow
+    ):
+        response = self.SUCCESS_RESPONSE.copy()
+        # Test custom expiration to confirm expiry is set correctly.
+        response["expires_in"] = 2800
+        expected_expiry = datetime.datetime.min + datetime.timedelta(
+            seconds=response["expires_in"]
+        )
+        headers = {
+            "Content-Type": "application/x-www-form-urlencoded",
+            "Authorization": "Basic {}".format(BASIC_AUTH_ENCODING),
+        }
+        request_data = {
+            "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "requested_token_type": "urn:ietf:params:oauth:token-type:access_token",
+            "subject_token": "subject_token_0",
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+        }
+        request = self.make_mock_request(status=http.client.OK, data=response)
+        # Client Auth will be sufficient for user project determination.
+        credentials = self.make_workforce_pool_credentials(
+            client_id=CLIENT_ID,
+            client_secret=CLIENT_SECRET,
+            workforce_pool_user_project=None,
+        )
+
+        credentials.refresh(request)
+
+        self.assert_token_request_kwargs(request.call_args[1], headers, request_data)
+        assert credentials.valid
+        assert credentials.expiry == expected_expiry
+        assert not credentials.expired
+        assert credentials.token == response["access_token"]
+
     def test_refresh_impersonation_without_client_auth_success(self):
         # Simulate service account access token expires in 2800 seconds.
         expire_time = (
@@ -549,6 +784,74 @@
         assert not credentials.expired
         assert credentials.token == impersonation_response["accessToken"]
 
+    def test_refresh_workforce_impersonation_without_client_auth_success(self):
+        # Simulate service account access token expires in 2800 seconds.
+        expire_time = (
+            _helpers.utcnow().replace(microsecond=0) + datetime.timedelta(seconds=2800)
+        ).isoformat("T") + "Z"
+        expected_expiry = datetime.datetime.strptime(expire_time, "%Y-%m-%dT%H:%M:%SZ")
+        # STS token exchange request/response.
+        token_response = self.SUCCESS_RESPONSE.copy()
+        token_headers = {"Content-Type": "application/x-www-form-urlencoded"}
+        token_request_data = {
+            "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "requested_token_type": "urn:ietf:params:oauth:token-type:access_token",
+            "subject_token": "subject_token_0",
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "scope": "https://www.googleapis.com/auth/iam",
+            "options": urllib.parse.quote(
+                json.dumps({"userProject": self.WORKFORCE_POOL_USER_PROJECT})
+            ),
+        }
+        # Service account impersonation request/response.
+        impersonation_response = {
+            "accessToken": "SA_ACCESS_TOKEN",
+            "expireTime": expire_time,
+        }
+        impersonation_headers = {
+            "Content-Type": "application/json",
+            "authorization": "Bearer {}".format(token_response["access_token"]),
+        }
+        impersonation_request_data = {
+            "delegates": None,
+            "scope": self.SCOPES,
+            "lifetime": "3600s",
+        }
+        # Initialize mock request to handle token exchange and service account
+        # impersonation request.
+        request = self.make_mock_request(
+            status=http.client.OK,
+            data=token_response,
+            impersonation_status=http.client.OK,
+            impersonation_data=impersonation_response,
+        )
+        # Initialize credentials with service account impersonation.
+        credentials = self.make_workforce_pool_credentials(
+            service_account_impersonation_url=self.SERVICE_ACCOUNT_IMPERSONATION_URL,
+            scopes=self.SCOPES,
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        credentials.refresh(request)
+
+        # Only 2 requests should be processed.
+        assert len(request.call_args_list) == 2
+        # Verify token exchange request parameters.
+        self.assert_token_request_kwargs(
+            request.call_args_list[0][1], token_headers, token_request_data
+        )
+        # Verify service account impersonation request parameters.
+        self.assert_impersonation_request_kwargs(
+            request.call_args_list[1][1],
+            impersonation_headers,
+            impersonation_request_data,
+        )
+        assert credentials.valid
+        assert credentials.expiry == expected_expiry
+        assert not credentials.expired
+        assert credentials.token == impersonation_response["accessToken"]
+
     def test_refresh_without_client_auth_success_explicit_user_scopes_ignore_default_scopes(
         self,
     ):
@@ -822,6 +1125,22 @@
             "authorization": "Bearer {}".format(self.SUCCESS_RESPONSE["access_token"])
         }
 
+    def test_apply_workforce_without_quota_project_id(self):
+        headers = {}
+        request = self.make_mock_request(
+            status=http.client.OK, data=self.SUCCESS_RESPONSE
+        )
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        credentials.refresh(request)
+        credentials.apply(headers)
+
+        assert headers == {
+            "authorization": "Bearer {}".format(self.SUCCESS_RESPONSE["access_token"])
+        }
+
     def test_apply_impersonation_without_quota_project_id(self):
         expire_time = (
             _helpers.utcnow().replace(microsecond=0) + datetime.timedelta(seconds=3600)
@@ -926,6 +1245,31 @@
             "authorization": "Bearer {}".format(self.SUCCESS_RESPONSE["access_token"]),
         }
 
+    def test_before_request_workforce(self):
+        headers = {"other": "header-value"}
+        request = self.make_mock_request(
+            status=http.client.OK, data=self.SUCCESS_RESPONSE
+        )
+        credentials = self.make_workforce_pool_credentials(
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT
+        )
+
+        # First call should call refresh, setting the token.
+        credentials.before_request(request, "POST", "https://example.com/api", headers)
+
+        assert headers == {
+            "other": "header-value",
+            "authorization": "Bearer {}".format(self.SUCCESS_RESPONSE["access_token"]),
+        }
+
+        # Second call shouldn't call refresh.
+        credentials.before_request(request, "POST", "https://example.com/api", headers)
+
+        assert headers == {
+            "other": "header-value",
+            "authorization": "Bearer {}".format(self.SUCCESS_RESPONSE["access_token"]),
+        }
+
     def test_before_request_impersonation(self):
         expire_time = (
             _helpers.utcnow().replace(microsecond=0) + datetime.timedelta(seconds=3600)
@@ -1091,6 +1435,17 @@
 
         assert credentials.project_number == self.PROJECT_NUMBER
 
+    def test_project_number_workforce(self):
+        credentials = CredentialsImpl(
+            audience=self.WORKFORCE_AUDIENCE,
+            subject_token_type=self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=self.TOKEN_URL,
+            credential_source=self.CREDENTIAL_SOURCE,
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        assert credentials.project_number is None
+
     def test_project_id_without_scopes(self):
         # Initialize credentials with no scopes.
         credentials = CredentialsImpl(
@@ -1190,6 +1545,68 @@
         # No additional requests.
         assert len(request.call_args_list) == 3
 
+    def test_workforce_pool_get_project_id_cloud_resource_manager_success(self):
+        # STS token exchange request/response.
+        token_headers = {"Content-Type": "application/x-www-form-urlencoded"}
+        token_request_data = {
+            "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange",
+            "audience": self.WORKFORCE_AUDIENCE,
+            "requested_token_type": "urn:ietf:params:oauth:token-type:access_token",
+            "subject_token": "subject_token_0",
+            "subject_token_type": self.WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "scope": "scope1 scope2",
+            "options": urllib.parse.quote(
+                json.dumps({"userProject": self.WORKFORCE_POOL_USER_PROJECT})
+            ),
+        }
+        # Initialize mock request to handle token exchange and cloud resource
+        # manager request.
+        request = self.make_mock_request(
+            status=http.client.OK,
+            data=self.SUCCESS_RESPONSE.copy(),
+            cloud_resource_manager_status=http.client.OK,
+            cloud_resource_manager_data=self.CLOUD_RESOURCE_MANAGER_SUCCESS_RESPONSE,
+        )
+        credentials = self.make_workforce_pool_credentials(
+            scopes=self.SCOPES,
+            quota_project_id=self.QUOTA_PROJECT_ID,
+            workforce_pool_user_project=self.WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        # Expected project ID from cloud resource manager response should be returned.
+        project_id = credentials.get_project_id(request)
+
+        assert project_id == self.PROJECT_ID
+        # 2 requests should be processed.
+        assert len(request.call_args_list) == 2
+        # Verify token exchange request parameters.
+        self.assert_token_request_kwargs(
+            request.call_args_list[0][1], token_headers, token_request_data
+        )
+        # In the process of getting project ID, an access token should be
+        # retrieved.
+        assert credentials.valid
+        assert not credentials.expired
+        assert credentials.token == self.SUCCESS_RESPONSE["access_token"]
+        # Verify cloud resource manager request parameters.
+        self.assert_resource_manager_request_kwargs(
+            request.call_args_list[1][1],
+            self.WORKFORCE_POOL_USER_PROJECT,
+            {
+                "x-goog-user-project": self.QUOTA_PROJECT_ID,
+                "authorization": "Bearer {}".format(
+                    self.SUCCESS_RESPONSE["access_token"]
+                ),
+            },
+        )
+
+        # Calling get_project_id again should return the cached project_id.
+        project_id = credentials.get_project_id(request)
+
+        assert project_id == self.PROJECT_ID
+        # No additional requests.
+        assert len(request.call_args_list) == 2
+
     def test_get_project_id_cloud_resource_manager_error(self):
         # Simulate resource doesn't have sufficient permissions to access
         # cloud resource manager.
diff --git a/tests/test_identity_pool.py b/tests/test_identity_pool.py
index efe11b0..e90e288 100644
--- a/tests/test_identity_pool.py
+++ b/tests/test_identity_pool.py
@@ -53,6 +53,11 @@
 TOKEN_URL = "https://sts.googleapis.com/v1/token"
 SUBJECT_TOKEN_TYPE = "urn:ietf:params:oauth:token-type:jwt"
 AUDIENCE = "//iam.googleapis.com/projects/123456/locations/global/workloadIdentityPools/POOL_ID/providers/PROVIDER_ID"
+WORKFORCE_AUDIENCE = (
+    "//iam.googleapis.com/locations/global/workforcePools/POOL_ID/providers/PROVIDER_ID"
+)
+WORKFORCE_SUBJECT_TOKEN_TYPE = "urn:ietf:params:oauth:token-type:id_token"
+WORKFORCE_POOL_USER_PROJECT = "WORKFORCE_POOL_USER_PROJECT_NUMBER"
 
 
 class TestCredentials(object):
@@ -158,6 +163,7 @@
         credential_data=None,
         scopes=None,
         default_scopes=None,
+        workforce_pool_user_project=None,
     ):
         """Utility to assert that a credentials are initialized with the expected
         attributes by calling refresh functionality and confirming response matches
@@ -183,6 +189,10 @@
             "subject_token": subject_token,
             "subject_token_type": subject_token_type,
         }
+        if workforce_pool_user_project:
+            token_request_data["options"] = urllib.parse.quote(
+                json.dumps({"userProject": workforce_pool_user_project})
+            )
 
         if service_account_impersonation_url:
             # Service account impersonation request/response.
@@ -250,6 +260,8 @@
     @classmethod
     def make_credentials(
         cls,
+        audience=AUDIENCE,
+        subject_token_type=SUBJECT_TOKEN_TYPE,
         client_id=None,
         client_secret=None,
         quota_project_id=None,
@@ -257,10 +269,11 @@
         default_scopes=None,
         service_account_impersonation_url=None,
         credential_source=None,
+        workforce_pool_user_project=None,
     ):
         return identity_pool.Credentials(
-            audience=AUDIENCE,
-            subject_token_type=SUBJECT_TOKEN_TYPE,
+            audience=audience,
+            subject_token_type=subject_token_type,
             token_url=TOKEN_URL,
             service_account_impersonation_url=service_account_impersonation_url,
             credential_source=credential_source,
@@ -269,6 +282,7 @@
             quota_project_id=quota_project_id,
             scopes=scopes,
             default_scopes=default_scopes,
+            workforce_pool_user_project=workforce_pool_user_project,
         )
 
     @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
@@ -297,6 +311,7 @@
             client_secret=CLIENT_SECRET,
             credential_source=self.CREDENTIAL_SOURCE_TEXT,
             quota_project_id=QUOTA_PROJECT_ID,
+            workforce_pool_user_project=None,
         )
 
     @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
@@ -321,6 +336,33 @@
             client_secret=None,
             credential_source=self.CREDENTIAL_SOURCE_TEXT,
             quota_project_id=None,
+            workforce_pool_user_project=None,
+        )
+
+    @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
+    def test_from_info_workforce_pool(self, mock_init):
+        credentials = identity_pool.Credentials.from_info(
+            {
+                "audience": WORKFORCE_AUDIENCE,
+                "subject_token_type": WORKFORCE_SUBJECT_TOKEN_TYPE,
+                "token_url": TOKEN_URL,
+                "credential_source": self.CREDENTIAL_SOURCE_TEXT,
+                "workforce_pool_user_project": WORKFORCE_POOL_USER_PROJECT,
+            }
+        )
+
+        # Confirm identity_pool.Credentials instantiated with expected attributes.
+        assert isinstance(credentials, identity_pool.Credentials)
+        mock_init.assert_called_once_with(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=None,
+            client_id=None,
+            client_secret=None,
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            quota_project_id=None,
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
         )
 
     @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
@@ -350,6 +392,7 @@
             client_secret=CLIENT_SECRET,
             credential_source=self.CREDENTIAL_SOURCE_TEXT,
             quota_project_id=QUOTA_PROJECT_ID,
+            workforce_pool_user_project=None,
         )
 
     @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
@@ -375,6 +418,46 @@
             client_secret=None,
             credential_source=self.CREDENTIAL_SOURCE_TEXT,
             quota_project_id=None,
+            workforce_pool_user_project=None,
+        )
+
+    @mock.patch.object(identity_pool.Credentials, "__init__", return_value=None)
+    def test_from_file_workforce_pool(self, mock_init, tmpdir):
+        info = {
+            "audience": WORKFORCE_AUDIENCE,
+            "subject_token_type": WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "token_url": TOKEN_URL,
+            "credential_source": self.CREDENTIAL_SOURCE_TEXT,
+            "workforce_pool_user_project": WORKFORCE_POOL_USER_PROJECT,
+        }
+        config_file = tmpdir.join("config.json")
+        config_file.write(json.dumps(info))
+        credentials = identity_pool.Credentials.from_file(str(config_file))
+
+        # Confirm identity_pool.Credentials instantiated with expected attributes.
+        assert isinstance(credentials, identity_pool.Credentials)
+        mock_init.assert_called_once_with(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=None,
+            client_id=None,
+            client_secret=None,
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            quota_project_id=None,
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+    def test_constructor_nonworkforce_with_workforce_pool_user_project(self):
+        with pytest.raises(ValueError) as excinfo:
+            self.make_credentials(
+                audience=AUDIENCE,
+                workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+            )
+
+        assert excinfo.match(
+            "workforce_pool_user_project should not be set for non-workforce "
+            "pool credentials"
         )
 
     def test_constructor_invalid_options(self):
@@ -430,6 +513,23 @@
             r"Missing subject_token_field_name for JSON credential_source format"
         )
 
+    def test_info_with_workforce_pool_user_project(self):
+        credentials = self.make_credentials(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            credential_source=self.CREDENTIAL_SOURCE_TEXT_URL.copy(),
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        assert credentials.info == {
+            "type": "external_account",
+            "audience": WORKFORCE_AUDIENCE,
+            "subject_token_type": WORKFORCE_SUBJECT_TOKEN_TYPE,
+            "token_url": TOKEN_URL,
+            "credential_source": self.CREDENTIAL_SOURCE_TEXT_URL,
+            "workforce_pool_user_project": WORKFORCE_POOL_USER_PROJECT,
+        }
+
     def test_info_with_file_credential_source(self):
         credentials = self.make_credentials(
             credential_source=self.CREDENTIAL_SOURCE_TEXT_URL.copy()
@@ -557,6 +657,115 @@
             default_scopes=["ignored"],
         )
 
+    def test_refresh_workforce_success_with_client_auth_without_impersonation(self):
+        credentials = self.make_credentials(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            client_id=CLIENT_ID,
+            client_secret=CLIENT_SECRET,
+            # Test with text format type.
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            scopes=SCOPES,
+            # This will be ignored in favor of client auth.
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        self.assert_underlying_credentials_refresh(
+            credentials=credentials,
+            audience=WORKFORCE_AUDIENCE,
+            subject_token=TEXT_FILE_SUBJECT_TOKEN,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=None,
+            basic_auth_encoding=BASIC_AUTH_ENCODING,
+            quota_project_id=None,
+            used_scopes=SCOPES,
+            scopes=SCOPES,
+            workforce_pool_user_project=None,
+        )
+
+    def test_refresh_workforce_success_with_client_auth_and_no_workforce_project(self):
+        credentials = self.make_credentials(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            client_id=CLIENT_ID,
+            client_secret=CLIENT_SECRET,
+            # Test with text format type.
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            scopes=SCOPES,
+            # This is not needed when client Auth is used.
+            workforce_pool_user_project=None,
+        )
+
+        self.assert_underlying_credentials_refresh(
+            credentials=credentials,
+            audience=WORKFORCE_AUDIENCE,
+            subject_token=TEXT_FILE_SUBJECT_TOKEN,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=None,
+            basic_auth_encoding=BASIC_AUTH_ENCODING,
+            quota_project_id=None,
+            used_scopes=SCOPES,
+            scopes=SCOPES,
+            workforce_pool_user_project=None,
+        )
+
+    def test_refresh_workforce_success_without_client_auth_without_impersonation(self):
+        credentials = self.make_credentials(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            client_id=None,
+            client_secret=None,
+            # Test with text format type.
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            scopes=SCOPES,
+            # This will not be ignored as client auth is not used.
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        self.assert_underlying_credentials_refresh(
+            credentials=credentials,
+            audience=WORKFORCE_AUDIENCE,
+            subject_token=TEXT_FILE_SUBJECT_TOKEN,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=None,
+            basic_auth_encoding=None,
+            quota_project_id=None,
+            used_scopes=SCOPES,
+            scopes=SCOPES,
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+    def test_refresh_workforce_success_without_client_auth_with_impersonation(self):
+        credentials = self.make_credentials(
+            audience=WORKFORCE_AUDIENCE,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            client_id=None,
+            client_secret=None,
+            service_account_impersonation_url=SERVICE_ACCOUNT_IMPERSONATION_URL,
+            # Test with text format type.
+            credential_source=self.CREDENTIAL_SOURCE_TEXT,
+            scopes=SCOPES,
+            # This will not be ignored as client auth is not used.
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
+        self.assert_underlying_credentials_refresh(
+            credentials=credentials,
+            audience=WORKFORCE_AUDIENCE,
+            subject_token=TEXT_FILE_SUBJECT_TOKEN,
+            subject_token_type=WORKFORCE_SUBJECT_TOKEN_TYPE,
+            token_url=TOKEN_URL,
+            service_account_impersonation_url=SERVICE_ACCOUNT_IMPERSONATION_URL,
+            basic_auth_encoding=None,
+            quota_project_id=None,
+            used_scopes=SCOPES,
+            scopes=SCOPES,
+            workforce_pool_user_project=WORKFORCE_POOL_USER_PROJECT,
+        )
+
     def test_refresh_text_file_success_without_impersonation_use_default_scopes(self):
         credentials = self.make_credentials(
             client_id=CLIENT_ID,