diff --git a/src/workos/user_management.py b/src/workos/user_management.py
index a1324822..b8a72d62 100644
--- a/src/workos/user_management.py
+++ b/src/workos/user_management.py
@@ -99,6 +99,7 @@
 INVITATION_DETAIL_BY_TOKEN_PATH = "user_management/invitations/by_token/{0}"
 INVITATION_REVOKE_PATH = "user_management/invitations/{0}/revoke"
 INVITATION_RESEND_PATH = "user_management/invitations/{0}/resend"
+INVITATION_ACCEPT_PATH = "user_management/invitations/{0}/accept"
 PASSWORD_RESET_PATH = "user_management/password_reset"
 PASSWORD_RESET_DETAIL_PATH = "user_management/password_reset/{0}"
 USER_FEATURE_FLAGS_PATH = "user_management/users/{0}/feature-flags"
@@ -915,6 +916,17 @@ def resend_invitation(self, invitation_id: str) -> SyncOrAsync[Invitation]:
         """
         ...
 
+    def accept_invitation(self, invitation_id: str) -> SyncOrAsync[Invitation]:
+        """Accepts an existing Invitation.
+
+        Args:
+            invitation_id (str):  The unique ID of the Invitation.
+
+        Returns:
+            Invitation: Invitation response from WorkOS.
+        """
+        ...
+
     def list_feature_flags(
         self,
         user_id: str,
@@ -1634,6 +1646,13 @@ def resend_invitation(self, invitation_id: str) -> Invitation:
 
         return Invitation.model_validate(response)
 
+    def accept_invitation(self, invitation_id: str) -> Invitation:
+        response = self._http_client.request(
+            INVITATION_ACCEPT_PATH.format(invitation_id), method=REQUEST_METHOD_POST
+        )
+
+        return Invitation.model_validate(response)
+
     def list_feature_flags(
         self,
         user_id: str,
@@ -2373,6 +2392,13 @@ async def resend_invitation(self, invitation_id: str) -> Invitation:
 
         return Invitation.model_validate(response)
 
+    async def accept_invitation(self, invitation_id: str) -> Invitation:
+        response = await self._http_client.request(
+            INVITATION_ACCEPT_PATH.format(invitation_id), method=REQUEST_METHOD_POST
+        )
+
+        return Invitation.model_validate(response)
+
     async def list_feature_flags(
         self,
         user_id: str,
diff --git a/tests/test_user_management.py b/tests/test_user_management.py
index dc9267cc..e4dd5b63 100644
--- a/tests/test_user_management.py
+++ b/tests/test_user_management.py
@@ -1260,6 +1260,44 @@ def test_resend_invitation_accepted(self, capture_and_mock_http_client_request):
         with pytest.raises(Exception):
             syncify(self.user_management.resend_invitation("invitation_accepted"))
 
+    def test_accept_invitation(
+        self, capture_and_mock_http_client_request, mock_invitation
+    ):
+        request_kwargs = capture_and_mock_http_client_request(
+            self.http_client, mock_invitation, 200
+        )
+
+        invitation = syncify(self.user_management.accept_invitation("invitation_ABCDE"))
+
+        assert request_kwargs["url"].endswith(
+            "user_management/invitations/invitation_ABCDE/accept"
+        )
+        assert request_kwargs["method"] == "post"
+        assert isinstance(invitation, Invitation)
+        assert invitation.id == "invitation_ABCDE"
+
+    def test_accept_invitation_not_found(self, capture_and_mock_http_client_request):
+        error_response = {
+            "message": "Invitation not found",
+            "code": "not_found",
+        }
+        capture_and_mock_http_client_request(self.http_client, error_response, 404)
+
+        with pytest.raises(Exception):
+            syncify(self.user_management.accept_invitation("invitation_nonexistent"))
+
+    def test_accept_invitation_already_accepted(
+        self, capture_and_mock_http_client_request
+    ):
+        error_response = {
+            "message": "Invite has already been accepted.",
+            "code": "invite_accepted",
+        }
+        capture_and_mock_http_client_request(self.http_client, error_response, 400)
+
+        with pytest.raises(Exception):
+            syncify(self.user_management.accept_invitation("invitation_accepted"))
+
     def test_list_feature_flags(
         self, mock_feature_flags, capture_and_mock_http_client_request
     ):