diff --git a/doc/contributors.rst b/doc/contributors.rst
index 4118d55586..74164ffd59 100644
--- a/doc/contributors.rst
+++ b/doc/contributors.rst
@@ -88,3 +88,4 @@ The following is a list of people who have contributed to
 - Terence Honles (terencehonles)
 - Paul Fisher (thetorpedodog)
 - Julius Park (juliusgeo)
+- Ishmum Jawad Khan (ishmum123)
diff --git a/pymongo/client_session.py b/pymongo/client_session.py
index dec2f4f918..e2d7caca58 100644
--- a/pymongo/client_session.py
+++ b/pymongo/client_session.py
@@ -827,6 +827,9 @@ def _start_retryable_write(self):
         self._check_ended()
         self._server_session.inc_transaction_id()
 
+    def __copy__(self):
+        raise TypeError('A ClientSession cannot be copied, create a new session instead')
+
 
 class _ServerSession(object):
     def __init__(self, generation):
diff --git a/test/test_session.py b/test/test_session.py
index 50dfd8a060..e1db9ccfd1 100644
--- a/test/test_session.py
+++ b/test/test_session.py
@@ -779,6 +779,11 @@ def drop_db():
 
         wait_until(drop_db, 'dropped database after w=0 writes')
 
+    def test_session_not_copyable(self):
+        client = self.client
+        with client.start_session() as s:
+            self.assertRaises(TypeError, lambda: copy.copy(s))
+
 
 class TestCausalConsistency(unittest.TestCase):