diff --git a/oauth2client/client.py b/oauth2client/client.py
index 2d60f5a..f492563 100644
--- a/oauth2client/client.py
+++ b/oauth2client/client.py
@@ -224,6 +224,13 @@
     """
     _abstract()
 
+  def locked_delete(self):
+    """Delete a credential.
+
+    The Storage lock must be held when this is called.
+    """
+    _abstract()
+
   def get(self):
     """Retrieve credential.
 
@@ -252,6 +259,21 @@
     finally:
       self.release_lock()
 
+  def delete(self):
+    """Delete credential.
+
+    Frees any resources associated with storing the credential.
+    The Storage lock must *not* be held when this is called.
+
+    Returns:
+      None
+    """
+    self.acquire_lock()
+    try:
+      return self.locked_delete()
+    finally:
+      self.release_lock()
+
 
 class OAuth2Credentials(Credentials):
   """Credentials object for OAuth 2.0.