diff --git a/cryptography/primitives/hashes.py b/cryptography/primitives/hashes.py
index 06d90a9..d0f4c22 100644
--- a/cryptography/primitives/hashes.py
+++ b/cryptography/primitives/hashes.py
@@ -82,3 +82,9 @@
     name = "whirlpool"
     digest_size = 64
     block_size = 64
+
+
+class MD5(BaseHash):
+    name = "md5"
+    digest_size = 16
+    block_size = 64
diff --git a/docs/primitives/cryptographic-hashes.rst b/docs/primitives/cryptographic-hashes.rst
new file mode 100644
index 0000000..1499f76
--- /dev/null
+++ b/docs/primitives/cryptographic-hashes.rst
@@ -0,0 +1,164 @@
+Message Digests
+====================
+
+SHA-1
+~~~~~~~
+
+.. attention::
+
+    NIST has deprecated SHA-1 in favor of the SHA-2 variants. New applications
+    are strongly suggested to use SHA-2 over SHA-1.
+
+.. class:: cryptography.primitives.hashes.SHA1()
+
+    SHA-1 is a cryptographic hash function standardized by NIST. It has a
+    160-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+
+SHA-2 Family
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.SHA224()
+
+    SHA-224 is a cryptographic hash function from the SHA-2 family and
+    standardized by NIST. It has a 224-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA256()
+
+    SHA-256 is a cryptographic hash function from the SHA-2 family and
+    standardized by NIST. It has a 256-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA384()
+
+    SHA-384 is a cryptographic hash function from the SHA-2 family and
+    standardized by NIST. It has a 384-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA512()
+
+    SHA-512 is a cryptographic hash function from the SHA-2 family and
+    standardized by NIST. It has a 512-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+RIPEMD160
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.RIPEMD160()
+
+    RIPEMD160 is a cryptographic hash function that is part of ISO/IEC
+    10118-3:2004. It has a 160-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+Whirlpool
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.Whirlpool()
+
+    Whirlpool is a cryptographic hash function that is part of ISO/IEC
+    10118-3:2004. It has a 512-bit message digest.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
+
+MD5
+~~~~~~~
+
+.. warning::
+
+    MD5 is a deprecated hash algorithm that has practical known collision
+    attacks. You are strongly discouraged from using it.
+
+.. class:: cryptography.primitives.hashes.MD5()
+
+    MD5 is a deprecated cryptographic hash function. It has a 160-bit message
+    digest and has practical known collision attacks.
+
+    .. method:: update(string)
+
+        :param bytes string: The bytes you wish to hash.
+
+    .. method:: digest()
+
+        :return bytes: The message digest as bytes.
+
+    .. method:: hexdigest()
+
+        :return str: The message digest as hex.
diff --git a/docs/primitives/index.rst b/docs/primitives/index.rst
index 1066e30..c18c62c 100644
--- a/docs/primitives/index.rst
+++ b/docs/primitives/index.rst
@@ -4,4 +4,5 @@
 .. toctree::
     :maxdepth: 1
 
+    cryptographic-hashes
     symmetric-encryption
diff --git a/tests/primitives/test_hash_vectors.py b/tests/primitives/test_hash_vectors.py
index 52c972a..02ef4db 100644
--- a/tests/primitives/test_hash_vectors.py
+++ b/tests/primitives/test_hash_vectors.py
@@ -131,3 +131,16 @@
         only_if=lambda api: api.supports_hash(hashes.Whirlpool),
         skip_message="Does not support Whirlpool",
     )
+
+
+class TestMD5(object):
+    test_md5 = generate_hash_test(
+        load_hash_vectors_from_file,
+        os.path.join("RFC", "MD5"),
+        [
+            "rfc-1321.txt",
+        ],
+        hashes.MD5,
+        only_if=lambda api: api.supports_hash(hashes.MD5),
+        skip_message="Does not support MD5",
+    )
diff --git a/tests/primitives/test_hashes.py b/tests/primitives/test_hashes.py
index 982fc7c..901ddab 100644
--- a/tests/primitives/test_hashes.py
+++ b/tests/primitives/test_hashes.py
@@ -86,3 +86,13 @@
         only_if=lambda api: api.supports_hash(hashes.Whirlpool),
         skip_message="Does not support Whirlpool",
     )
+
+
+class TestMD5(object):
+    test_MD5 = generate_base_hash_test(
+        hashes.MD5,
+        digest_size=16,
+        block_size=64,
+        only_if=lambda api: api.supports_hash(hashes.MD5),
+        skip_message="Does not support MD5",
+    )