diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -44,7 +44,10 @@
   UpdateUserAvatarResponse,
 } from '../types/avatar-types.js';
 import type { RawEntryInfo, CalendarQuery } from '../types/entry-types.js';
-import type { IdentityAuthResult } from '../types/identity-service-types.js';
+import type {
+  Identities,
+  IdentityAuthResult,
+} from '../types/identity-service-types';
 import type {
   RawMessageInfo,
   MessageTruncationStatuses,
@@ -1006,6 +1009,21 @@
 
 const processNewUserIDsActionType = 'PROCESS_NEW_USER_IDS';
 
+const findUserIdentitiesActionTypes = Object.freeze({
+  started: 'FIND_USER_IDENTITIES_STARTED',
+  success: 'FIND_USER_IDENTITIES_SUCCESS',
+  failed: 'FIND_USER_IDENTITIES_FAILED',
+});
+
+function useFindUserIdentities(): (
+  userIDs: $ReadOnlyArray<string>,
+) => Promise<Identities> {
+  const client = React.useContext(IdentityClientContext);
+  const identityClient = client?.identityClient;
+  invariant(identityClient, 'Identity client should be set');
+  return identityClient.findUserIdentities;
+}
+
 export {
   changeKeyserverUserPasswordActionTypes,
   changeKeyserverUserPassword,
@@ -1052,4 +1070,6 @@
   identityGenerateNonceActionTypes,
   useIdentityGenerateNonce,
   processNewUserIDsActionType,
+  findUserIdentitiesActionTypes,
+  useFindUserIdentities,
 };
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -58,7 +58,7 @@
   CalendarThreadFilter,
   SetCalendarDeletedFilterPayload,
 } from './filter-types.js';
-import type { IdentityAuthResult } from './identity-service-types.js';
+import type { IdentityAuthResult } from './identity-service-types';
 import type { IntegrityStore } from './integrity-types.js';
 import type {
   KeyserverStore,
@@ -141,7 +141,12 @@
   RoleDeletionPayload,
 } from './thread-types.js';
 import type { ClientUpdatesResultWithUserInfos } from './update-types.js';
-import type { CurrentUserInfo, UserInfos, UserStore } from './user-types.js';
+import type {
+  CurrentUserInfo,
+  UserInfos,
+  UserStore,
+  UserInfo,
+} from './user-types.js';
 import type { SetDeviceTokenActionPayload } from '../actions/device-actions.js';
 import type {
   UpdateConnectionStatusPayload,
@@ -1448,6 +1453,24 @@
           +userIDs: $ReadOnlyArray<string>,
         },
         +loadingInfo: LoadingInfo,
+      }
+    | {
+        +type: 'FIND_USER_IDENTITIES_STARTED',
+        +loadingInfo?: LoadingInfo,
+        +payload?: void,
+      }
+    | {
+        +type: 'FIND_USER_IDENTITIES_SUCCESS',
+        +payload: {
+          +userInfos: $ReadOnlyArray<UserInfo>,
+        },
+        +loadingInfo: LoadingInfo,
+      }
+    | {
+        +type: 'FIND_USER_IDENTITIES_FAILED',
+        +error: true,
+        +payload: Error,
+        +loadingInfo: LoadingInfo,
       },
 }>;