diff --git a/src/__tests__/lib/exampleData.js b/src/__tests__/lib/exampleData.js
index 768ad8f2680..c43a45ec433 100644
--- a/src/__tests__/lib/exampleData.js
+++ b/src/__tests__/lib/exampleData.js
@@ -225,6 +225,7 @@ export const makeAccount = (
     zulipVersion?: ZulipVersion | null,
     ackedPushToken?: string | null,
     lastDismissedServerPushSetupNotice?: Date | null,
+    lastDismissedServerNotifsExpiringBanner?: Date | null,
   |} = Object.freeze({}),
 ): Account => {
   const {
@@ -237,6 +238,7 @@ export const makeAccount = (
     zulipVersion: zulipVersionInner = recentZulipVersion,
     ackedPushToken = null,
     lastDismissedServerPushSetupNotice = null,
+    lastDismissedServerNotifsExpiringBanner = null,
   } = args;
   return deepFreeze({
     realm: realmInner,
@@ -247,6 +249,7 @@ export const makeAccount = (
     zulipVersion: zulipVersionInner,
     ackedPushToken,
     lastDismissedServerPushSetupNotice,
+    lastDismissedServerNotifsExpiringBanner,
     silenceServerPushSetupWarnings: false,
   });
 };
@@ -648,6 +651,7 @@ export const plusReduxState: GlobalState & PerAccountState = reduxState({
       zulipVersion: recentZulipVersion,
       zulipFeatureLevel: recentZulipFeatureLevel,
       lastDismissedServerPushSetupNotice: null,
+      lastDismissedServerNotifsExpiringBanner: null,
       silenceServerPushSetupWarnings: false,
     },
   ],
diff --git a/src/account/__tests__/accountsReducer-test.js b/src/account/__tests__/accountsReducer-test.js
index 782b0040edb..63d46de370f 100644
--- a/src/account/__tests__/accountsReducer-test.js
+++ b/src/account/__tests__/accountsReducer-test.js
@@ -73,6 +73,31 @@ describe('accountsReducer', () => {
       );
       expect(actualState).toEqual([account]);
     });
+
+    test('when realm_push_notifications_enabled_end_timestamp is null, clears lastDismissedServerNotifsExpiringBanner', () => {
+      const account = { ...eg.selfAccount, lastDismissedServerNotifsExpiringBanner: new Date() };
+      const actualState = accountsReducer(
+        [account],
+        eg.mkActionRegisterComplete({ realm_push_notifications_enabled_end_timestamp: null }),
+      );
+      expect(actualState).toEqual([{ ...account, lastDismissedServerNotifsExpiringBanner: null }]);
+    });
+
+    test('when realm_push_notifications_enabled_end_timestamp is not null, preserves lastDismissedServerNotifsExpiringBanner', () => {
+      const account = { ...eg.selfAccount, lastDismissedServerNotifsExpiringBanner: new Date() };
+      const actualState = accountsReducer(
+        [account],
+        eg.mkActionRegisterComplete({ realm_push_notifications_enabled_end_timestamp: 1705616035 }),
+      );
+      expect(actualState).toEqual([account]);
+    });
+
+    // TODO(server-8.0)
+    test('legacy: when realm_push_notifications_enabled_end_timestamp missing, preserves lastDismissedServerNotifsExpiringBanner: null', () => {
+      const account = { ...eg.selfAccount, lastDismissedServerNotifsExpiringBanner: null };
+      const actualState = accountsReducer([account], eg.mkActionRegisterComplete({}));
+      expect(actualState).toEqual([account]);
+    });
   });
 
   describe('ACCOUNT_SWITCH', () => {
@@ -296,5 +321,58 @@ describe('accountsReducer', () => {
         expect(actualState).toEqual(stateWithoutDismissedNotice);
       });
     });
+
+    describe('lastDismissedServerNotifsExpiringBanner', () => {
+      const stateWithDismissedBanner = [
+        { ...eg.plusReduxState.accounts[0], lastDismissedServerNotifsExpiringBanner: new Date() },
+      ];
+      const stateWithoutDismissedBanner = [
+        { ...eg.plusReduxState.accounts[0], lastDismissedServerNotifsExpiringBanner: null },
+      ];
+
+      const someTimestamp = 1705616035;
+
+      test('data.push_notifications_enabled_end_timestamp is null, on state with dismissed banner', () => {
+        const actualState = accountsReducer(
+          stateWithDismissedBanner,
+          eventWith({ push_notifications_enabled_end_timestamp: null }),
+        );
+        expect(actualState).toEqual(stateWithoutDismissedBanner);
+      });
+
+      test('data.push_notifications_enabled_end_timestamp is null, on state without dismissed banner', () => {
+        const actualState = accountsReducer(
+          stateWithoutDismissedBanner,
+          eventWith({ push_notifications_enabled_end_timestamp: null }),
+        );
+        expect(actualState).toEqual(stateWithoutDismissedBanner);
+      });
+
+      test('data.push_notifications_enabled_end_timestamp is non-null, on state with dismissed banner', () => {
+        const actualState = accountsReducer(
+          stateWithDismissedBanner,
+          eventWith({ push_notifications_enabled_end_timestamp: someTimestamp }),
+        );
+        expect(actualState).toEqual(stateWithDismissedBanner);
+      });
+
+      test('data.push_notifications_enabled_end_timestamp is non-null, on state without dismissed banner', () => {
+        const actualState = accountsReducer(
+          stateWithoutDismissedBanner,
+          eventWith({ push_notifications_enabled_end_timestamp: someTimestamp }),
+        );
+        expect(actualState).toEqual(stateWithoutDismissedBanner);
+      });
+
+      test('data.push_notifications_enabled_end_timestamp is absent, on state with dismissed banner', () => {
+        const actualState = accountsReducer(stateWithDismissedBanner, eventWith({}));
+        expect(actualState).toEqual(stateWithDismissedBanner);
+      });
+
+      test('data.push_notifications_enabled_end_timestamp is absent, on state without dismissed banner', () => {
+        const actualState = accountsReducer(stateWithoutDismissedBanner, eventWith({}));
+        expect(actualState).toEqual(stateWithoutDismissedBanner);
+      });
+    });
   });
 });
diff --git a/src/account/accountActions.js b/src/account/accountActions.js
index b88d32f43ad..604945977a2 100644
--- a/src/account/accountActions.js
+++ b/src/account/accountActions.js
@@ -7,6 +7,7 @@ import {
   LOGIN_SUCCESS,
   DISMISS_SERVER_PUSH_SETUP_NOTICE,
   SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS,
+  DISMISS_SERVER_NOTIFS_EXPIRING_BANNER,
 } from '../actionConstants';
 import { registerAndStartPolling } from '../events/eventActions';
 import { resetToMainTabs } from '../nav/navActions';
@@ -23,6 +24,15 @@ export const dismissServerPushSetupNotice = (): PerAccountAction => ({
   date: new Date(),
 });
 
+export const dismissServerNotifsExpiringBanner = (): PerAccountAction => ({
+  type: DISMISS_SERVER_NOTIFS_EXPIRING_BANNER,
+
+  // We don't compute this in a reducer function. Those should be pure
+  // functions of their params:
+  //   https://redux.js.org/tutorials/fundamentals/part-3-state-actions-reducers#rules-of-reducers
+  date: new Date(),
+});
+
 export const setSilenceServerPushSetupWarnings = (value: boolean): PerAccountAction => ({
   type: SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS,
   value,
diff --git a/src/account/accountsReducer.js b/src/account/accountsReducer.js
index 3957ffe1f80..d1db546ea4b 100644
--- a/src/account/accountsReducer.js
+++ b/src/account/accountsReducer.js
@@ -12,6 +12,7 @@ import {
   DISMISS_SERVER_PUSH_SETUP_NOTICE,
   ACCOUNT_REMOVE,
   SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS,
+  DISMISS_SERVER_NOTIFS_EXPIRING_BANNER,
 } from '../actionConstants';
 import { EventTypes } from '../api/eventTypes';
 import type { AccountsState, Identity, Action, Account } from '../types';
@@ -51,6 +52,10 @@ export default (state: AccountsState = initialState, action: Action): AccountsSt
         lastDismissedServerPushSetupNotice: action.data.realm_push_notifications_enabled
           ? null
           : current.lastDismissedServerPushSetupNotice,
+        lastDismissedServerNotifsExpiringBanner:
+          action.data.realm_push_notifications_enabled_end_timestamp == null
+            ? null
+            : current.lastDismissedServerNotifsExpiringBanner,
       }));
 
     case ACCOUNT_SWITCH: {
@@ -79,6 +84,7 @@ export default (state: AccountsState = initialState, action: Action): AccountsSt
             zulipVersion: null,
             zulipFeatureLevel: null,
             lastDismissedServerPushSetupNotice: null,
+            lastDismissedServerNotifsExpiringBanner: null,
             silenceServerPushSetupWarnings: false,
           },
           ...state,
@@ -136,6 +142,13 @@ export default (state: AccountsState = initialState, action: Action): AccountsSt
       }));
     }
 
+    case DISMISS_SERVER_NOTIFS_EXPIRING_BANNER: {
+      return updateActiveAccount(state, current => ({
+        ...current,
+        lastDismissedServerNotifsExpiringBanner: action.date,
+      }));
+    }
+
     case SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS: {
       return updateActiveAccount(state, current => ({
         ...current,
@@ -178,6 +191,10 @@ export default (state: AccountsState = initialState, action: Action): AccountsSt
                 event.data.push_notifications_enabled === true
                   ? null
                   : current.lastDismissedServerPushSetupNotice,
+              lastDismissedServerNotifsExpiringBanner:
+                event.data.push_notifications_enabled_end_timestamp === null
+                  ? null
+                  : current.lastDismissedServerNotifsExpiringBanner,
             }));
           }
 
diff --git a/src/actionConstants.js b/src/actionConstants.js
index 5c354fcd6cf..06a7e3dc388 100644
--- a/src/actionConstants.js
+++ b/src/actionConstants.js
@@ -21,6 +21,8 @@ export const REFRESH_SERVER_EMOJI_DATA: 'REFRESH_SERVER_EMOJI_DATA' = 'REFRESH_S
 
 export const DISMISS_SERVER_PUSH_SETUP_NOTICE: 'DISMISS_SERVER_PUSH_SETUP_NOTICE' =
   'DISMISS_SERVER_PUSH_SETUP_NOTICE';
+export const DISMISS_SERVER_NOTIFS_EXPIRING_BANNER: 'DISMISS_SERVER_NOTIFS_EXPIRING_BANNER' =
+  'DISMISS_SERVER_NOTIFS_EXPIRING_BANNER';
 export const SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS: 'SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS' =
   'SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS';
 
diff --git a/src/actionTypes.js b/src/actionTypes.js
index ca767b492ac..e86378dc704 100644
--- a/src/actionTypes.js
+++ b/src/actionTypes.js
@@ -61,6 +61,7 @@ import {
   REGISTER_PUSH_TOKEN_START,
   REGISTER_PUSH_TOKEN_END,
   SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS,
+  DISMISS_SERVER_NOTIFS_EXPIRING_BANNER,
 } from './actionConstants';
 
 import type { UserMessageFlag } from './api/modelTypes';
@@ -177,6 +178,11 @@ type DismissServerPushSetupNoticeAction = $ReadOnly<{|
   date: Date,
 |}>;
 
+type DismissServerNotifsExpiringBannerAction = $ReadOnly<{|
+  type: typeof DISMISS_SERVER_NOTIFS_EXPIRING_BANNER,
+  date: Date,
+|}>;
+
 type SetSilenceServerPushSetupWarningsAction = $ReadOnly<{|
   type: typeof SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS,
   value: boolean,
@@ -677,6 +683,7 @@ export type PerAccountAction =
   // state.session
   | DismissServerCompatNoticeAction
   | DismissServerPushSetupNoticeAction
+  | DismissServerNotifsExpiringBannerAction
   | SetSilenceServerPushSetupWarningsAction
   | ToggleOutboxSendingAction
   ;
@@ -804,6 +811,7 @@ export function isPerAccountApplicableAction(action: Action): boolean {
     case CLEAR_TYPING:
     case DISMISS_SERVER_COMPAT_NOTICE:
     case DISMISS_SERVER_PUSH_SETUP_NOTICE:
+    case DISMISS_SERVER_NOTIFS_EXPIRING_BANNER:
     case SET_SILENCE_SERVER_PUSH_SETUP_WARNINGS:
     case TOGGLE_OUTBOX_SENDING:
       (action: PerAccountAction);
diff --git a/src/common/ServerNotifsExpiringBanner.js b/src/common/ServerNotifsExpiringBanner.js
new file mode 100644
index 00000000000..0b945aa066a
--- /dev/null
+++ b/src/common/ServerNotifsExpiringBanner.js
@@ -0,0 +1,76 @@
+/* @flow strict-local */
+
+import React from 'react';
+import type { Node } from 'react';
+import subWeeks from 'date-fns/subWeeks';
+
+import ZulipBanner from './ZulipBanner';
+import { useSelector, useDispatch, useGlobalSelector } from '../react-redux';
+import { getAccount, getSilenceServerPushSetupWarnings } from '../account/accountsSelectors';
+import { dismissServerNotifsExpiringBanner } from '../account/accountActions';
+import {
+  kPushNotificationsEnabledEndDoc,
+  pushNotificationsEnabledEndTimestampWarning,
+} from '../settings/NotifTroubleshootingScreen';
+import { useDateRefreshedAtInterval } from '../reactUtils';
+import { openLinkWithUserPreference } from '../utils/openLink';
+import { getGlobalSettings } from '../directSelectors';
+
+type Props = $ReadOnly<{||}>;
+
+/**
+ * A "nag banner" saying the server will soon disable notifications, if so.
+ *
+ * Offers a dismiss button. If this notice is dismissed, it sleeps for a
+ * week, then reappears if the warning still applies.
+ */
+export default function ServerNotifsExpiringBanner(props: Props): Node {
+  const dispatch = useDispatch();
+
+  const globalSettings = useGlobalSelector(getGlobalSettings);
+
+  const lastDismissedServerNotifsExpiringBanner = useSelector(
+    state => getAccount(state).lastDismissedServerNotifsExpiringBanner,
+  );
+
+  const perAccountState = useSelector(state => state);
+  const dateNow = useDateRefreshedAtInterval(60_000);
+
+  const expiryWarning = pushNotificationsEnabledEndTimestampWarning(perAccountState, dateNow);
+
+  const silenceServerPushSetupWarnings = useSelector(getSilenceServerPushSetupWarnings);
+
+  let visible = false;
+  let text = '';
+  if (expiryWarning == null) {
+    // don't show
+  } else if (silenceServerPushSetupWarnings) {
+    // don't show
+  } else if (
+    lastDismissedServerNotifsExpiringBanner !== null
+    && lastDismissedServerNotifsExpiringBanner >= subWeeks(dateNow, 1)
+  ) {
+    // don't show
+  } else {
+    visible = true;
+    text = expiryWarning.reactText;
+  }
+
+  const buttons = [];
+  buttons.push({
+    id: 'dismiss',
+    label: 'Dismiss',
+    onPress: () => {
+      dispatch(dismissServerNotifsExpiringBanner());
+    },
+  });
+  buttons.push({
+    id: 'learn-more',
+    label: 'Learn more',
+    onPress: () => {
+      openLinkWithUserPreference(kPushNotificationsEnabledEndDoc, globalSettings);
+    },
+  });
+
+  return <ZulipBanner visible={visible} text={text} buttons={buttons} />;
+}
diff --git a/src/main/HomeScreen.js b/src/main/HomeScreen.js
index e5dde7aa722..0872f6fce52 100644
--- a/src/main/HomeScreen.js
+++ b/src/main/HomeScreen.js
@@ -18,6 +18,7 @@ import LoadingBanner from '../common/LoadingBanner';
 import ServerCompatBanner from '../common/ServerCompatBanner';
 import ServerNotifsDisabledBanner from '../common/ServerNotifsDisabledBanner';
 import { OfflineNoticePlaceholder } from '../boot/OfflineNoticeProvider';
+import ServerNotifsExpiringBanner from '../common/ServerNotifsExpiringBanner';
 
 const styles = createStyleSheet({
   wrapper: {
@@ -71,6 +72,7 @@ export default function HomeScreen(props: Props): Node {
       </View>
       <ServerCompatBanner />
       <ServerNotifsDisabledBanner navigation={navigation} />
+      <ServerNotifsExpiringBanner />
       <LoadingBanner />
       <UnreadCards />
     </SafeAreaView>
diff --git a/src/storage/__tests__/migrations-test.js b/src/storage/__tests__/migrations-test.js
index 5e545092c85..86bdd731307 100644
--- a/src/storage/__tests__/migrations-test.js
+++ b/src/storage/__tests__/migrations-test.js
@@ -106,13 +106,24 @@ describe('migrations', () => {
   const base62 = {
     ...base52,
     migrations: { version: 62 },
-    accounts: base52.accounts.map(a => ({ ...a, silenceServerPushSetupWarnings: false })),
+    // $FlowIgnore[prop-missing] same type-lie as in the test, below at end
+    accounts: base52.accounts.map(a => ({
+      ...a,
+      silenceServerPushSetupWarnings: false,
+    })),
+  };
+
+  // What `base` becomes after migrations up through 66.
+  const base66 = {
+    ...base62,
+    migrations: { version: 66 },
+    accounts: base62.accounts.map(a => ({ ...a, lastDismissedServerNotifsExpiringBanner: null })),
   };
 
   // What `base` becomes after all migrations.
   const endBase = {
-    ...base62,
-    migrations: { version: 65 },
+    ...base66,
+    migrations: { version: 66 },
   };
 
   for (const [desc, before, after] of [
diff --git a/src/storage/migrations.js b/src/storage/migrations.js
index cec93ff111a..915796280cb 100644
--- a/src/storage/migrations.js
+++ b/src/storage/migrations.js
@@ -535,6 +535,12 @@ const migrationsInner: {| [string]: (LessPartialState) => LessPartialState |} =
   // Add pushNotificationsEnabledEndTimestamp to state.realm
   '65': dropCache,
 
+  // Add `accounts[].lastDismissedServerNotifsExpiringBanner`, as Date | null.
+  '66': state => ({
+    ...state,
+    accounts: state.accounts.map(a => ({ ...a, lastDismissedServerNotifsExpiringBanner: null })),
+  }),
+
   // TIP: When adding a migration, consider just using `dropCache`.
   //   (See its jsdoc for guidance on when that's the right answer.)
 };
diff --git a/src/types.js b/src/types.js
index 80a9aae43f5..94dcd37d207 100644
--- a/src/types.js
+++ b/src/types.js
@@ -143,17 +143,26 @@ export type Account = $ReadOnly<{|
    */
   lastDismissedServerPushSetupNotice: Date | null,
 
+  /**
+   * When the user last dismissed the server-notifs-soon-to-expire notice.
+   *
+   * `null` when the user hasn't dismissed this notice.
+   */
+  lastDismissedServerNotifsExpiringBanner: Date | null,
+
   /**
    * The setting to silence prominent warnings about disabled notifications.
    *
    * ("Disabled" meaning in particular that the realm hasn't enabled
-   * notifications, i.e., RealmState.pushNotificationsEnabled is false.)
+   * notifications, i.e., RealmState.pushNotificationsEnabled is false;
+   * or that the realm is expected to disable them soon, i.e.,
+   * RealmState.pushNotificationsEnabledEndTimestamp is approaching.)
    *
    * Users will set this if they want something more permanent than the
-   * ServerNotifsDisabledBanner's "Dismiss" button. That button only snoozes the
-   * banner (for two weeks, as of writing), but this setting makes the
-   * banner never appear. (The banner's information will still be available
-   * on the "Notifications" screen.)
+   * "Dismiss" button on the ServerNotifsDisabledBanner or the
+   * ServerNotifsExpiringBanner. That button only snoozes the banner, but
+   * this setting makes the banner never appear. (The banner's information
+   * will still be available on the "Notifications" screen.)
    *
    * Defaults to off / `false`.
    */