diff --git a/google/auth/crypt/_cryptography_rsa.py b/google/auth/crypt/_cryptography_rsa.py
index 4f2d61166..1a3e9ff52 100644
--- a/google/auth/crypt/_cryptography_rsa.py
+++ b/google/auth/crypt/_cryptography_rsa.py
@@ -134,3 +134,18 @@ def from_string(cls, key, key_id=None):
             key, password=None, backend=_BACKEND
         )
         return cls(private_key, key_id=key_id)
+
+    def __getstate__(self):
+        """Pickle helper that serializes the _key attribute."""
+        state = self.__dict__.copy()
+        state["_key"] = self._key.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.PKCS8,
+            encryption_algorithm=serialization.NoEncryption(),
+        )
+        return state
+
+    def __setstate__(self, state):
+        """Pickle helper that deserializes the _key attribute."""
+        state["_key"] = serialization.load_pem_private_key(state["_key"], None)
+        self.__dict__.update(state)
diff --git a/google/auth/crypt/es256.py b/google/auth/crypt/es256.py
index 7920cc7ff..820e4becc 100644
--- a/google/auth/crypt/es256.py
+++ b/google/auth/crypt/es256.py
@@ -158,3 +158,18 @@ def from_string(cls, key, key_id=None):
             key, password=None, backend=_BACKEND
         )
         return cls(private_key, key_id=key_id)
+
+    def __getstate__(self):
+        """Pickle helper that serializes the _key attribute."""
+        state = self.__dict__.copy()
+        state["_key"] = self._key.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.PKCS8,
+            encryption_algorithm=serialization.NoEncryption(),
+        )
+        return state
+
+    def __setstate__(self, state):
+        """Pickle helper that deserializes the _key attribute."""
+        state["_key"] = serialization.load_pem_private_key(state["_key"], None)
+        self.__dict__.update(state)
diff --git a/system_tests/secrets.tar.enc b/system_tests/secrets.tar.enc
index cae671c34..1e35ceb60 100644
Binary files a/system_tests/secrets.tar.enc and b/system_tests/secrets.tar.enc differ
diff --git a/tests/crypt/test__cryptography_rsa.py b/tests/crypt/test__cryptography_rsa.py
index 99d8fc37c..1199f8d1b 100644
--- a/tests/crypt/test__cryptography_rsa.py
+++ b/tests/crypt/test__cryptography_rsa.py
@@ -14,6 +14,7 @@
 
 import json
 import os
+import pickle
 
 from cryptography.hazmat.primitives.asymmetric import rsa
 import pytest  # type: ignore
@@ -159,3 +160,17 @@ def test_from_service_account_file(self):
 
         assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
         assert isinstance(signer._key, rsa.RSAPrivateKey)
+
+    def test_pickle(self):
+        signer = _cryptography_rsa.RSASigner.from_service_account_file(
+            SERVICE_ACCOUNT_JSON_FILE
+        )
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, rsa.RSAPrivateKey)
+
+        pickled_signer = pickle.dumps(signer)
+        signer = pickle.loads(pickled_signer)
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, rsa.RSAPrivateKey)
diff --git a/tests/crypt/test_es256.py b/tests/crypt/test_es256.py
index 33465ce6d..f87648db4 100644
--- a/tests/crypt/test_es256.py
+++ b/tests/crypt/test_es256.py
@@ -15,6 +15,7 @@
 import base64
 import json
 import os
+import pickle
 
 from cryptography.hazmat.primitives.asymmetric import ec
 import pytest  # type: ignore
@@ -141,3 +142,15 @@ def test_from_service_account_file(self):
 
         assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
         assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
+
+    def test_pickle(self):
+        signer = es256.ES256Signer.from_service_account_file(SERVICE_ACCOUNT_JSON_FILE)
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
+
+        pickled_signer = pickle.dumps(signer)
+        signer = pickle.loads(pickled_signer)
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)