diff --git a/synapse/rest/client/mutual_rooms.py b/synapse/rest/client/mutual_rooms.py
new file mode 100644
index 0000000000..d3872a76c8
--- /dev/null
+++ b/synapse/rest/client/mutual_rooms.py
@@ -0,0 +1,76 @@
+# Copyright 2020 Half-Shot
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import TYPE_CHECKING, Tuple
+
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.server import HttpServer
+from synapse.http.servlet import RestServlet
+from synapse.http.site import SynapseRequest
+from synapse.types import JsonDict, UserID
+
+from ._base import client_patterns
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class UserMutualRoomsServlet(RestServlet):
+ """
+ GET /uk.half-shot.msc2666/user/mutual_rooms/{user_id} HTTP/1.1
+ """
+
+ PATTERNS = client_patterns(
+ "/uk.half-shot.msc2666/user/mutual_rooms/(?P<user_id>[^/]*)",
+ releases=(), # This is an unstable feature
+ )
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+ self.auth = hs.get_auth()
+ self.store = hs.get_datastores().main
+ self.user_directory_active = hs.config.server.update_user_directory
+
+ async def on_GET(
+ self, request: SynapseRequest, user_id: str
+ ) -> Tuple[int, JsonDict]:
+
+ if not self.user_directory_active:
+ raise SynapseError(
+ code=400,
+ msg="The user directory is disabled on this server. Cannot determine shared rooms.",
+ errcode=Codes.FORBIDDEN,
+ )
+
+ UserID.from_string(user_id)
+
+ requester = await self.auth.get_user_by_req(request)
+ if user_id == requester.user.to_string():
+ raise SynapseError(
+ code=400,
+ msg="You cannot request a list of shared rooms with yourself",
+ errcode=Codes.FORBIDDEN,
+ )
+
+ rooms = await self.store.get_mutual_rooms_for_users(
+ requester.user.to_string(), user_id
+ )
+
+ return 200, {"joined": list(rooms)}
+
+
+def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
+ UserMutualRoomsServlet(hs).register(http_server)
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