diff --git a/clientapi/routing/membership.go b/clientapi/routing/membership.go
index fe0795577..8109900a9 100644
--- a/clientapi/routing/membership.go
+++ b/clientapi/routing/membership.go
@@ -407,3 +407,48 @@ func checkMemberInRoom(ctx context.Context, rsAPI api.RoomserverInternalAPI, use
 	}
 	return nil
 }
+
+func SendForget(
+	req *http.Request, device *userapi.Device,
+	roomID string, cfg *config.ClientAPI,
+	rsAPI roomserverAPI.RoomserverInternalAPI, asAPI appserviceAPI.AppServiceQueryAPI,
+) util.JSONResponse {
+	ctx := req.Context()
+	logger := util.GetLogger(ctx).WithField("roomID", roomID).WithField("userID", device.UserID)
+	var membershipRes api.QueryMembershipForUserResponse
+	membershipReq := api.QueryMembershipForUserRequest{
+		RoomID: roomID,
+		UserID: device.UserID,
+	}
+	err := rsAPI.QueryMembershipForUser(ctx, &membershipReq, &membershipRes)
+	if err != nil {
+		logger.WithError(err).Error("QueryMembershipForUser: could not query membership for user")
+		return jsonerror.InternalServerError()
+	}
+	if membershipRes.IsInRoom {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("user is still a member of the room"),
+		}
+	}
+	if !membershipRes.HasBeenInRoom {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("user did not belong to room"),
+		}
+	}
+
+	request := api.PerformForgetRequest{
+		RoomID: roomID,
+		UserID: device.UserID,
+	}
+	response := api.PerformForgetResponse{}
+	if err := rsAPI.PerformForget(ctx, &request, &response); err != nil {
+		logger.WithError(err).Error("PerformForget: unable to forget room")
+		return jsonerror.InternalServerError()
+	}
+	return util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: struct{}{},
+	}
+}
diff --git a/clientapi/routing/routing.go b/clientapi/routing/routing.go
index 4f99237f5..1bc84c8ce 100644
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@@ -709,6 +709,19 @@ func Setup(
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)
 
+	r0mux.Handle("/rooms/{roomID}/forget",
+		httputil.MakeAuthAPI("rooms_forget", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
+			if r := rateLimits.rateLimit(req); r != nil {
+				return *r
+			}
+			vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
+			if err != nil {
+				return util.ErrorResponse(err)
+			}
+			return SendForget(req, device, vars["roomID"], cfg, rsAPI, asAPI)
+		}),
+	).Methods(http.MethodPost, http.MethodOptions)
+
 	r0mux.Handle("/devices",
 		httputil.MakeAuthAPI("get_devices", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
 			return GetDevicesByLocalpart(req, userAPI, device)