diff --git a/i18n/en.json b/i18n/en.json
index 3bb0ce1ad8..3a887782f4 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -1631,6 +1631,7 @@
   "set_date_of_birth": "Set date of birth",
   "set_profile_picture": "Set profile picture",
   "set_slideshow_to_fullscreen": "Set Slideshow to fullscreen",
+  "set_stack_primary_asset": "Set as primary asset",
   "setting_image_viewer_help": "The detail viewer loads the small thumbnail first, then loads the medium-size preview (if enabled), finally loads the original (if enabled).",
   "setting_image_viewer_original_subtitle": "Enable to load the original full-resolution image (large!). Disable to reduce data usage (both network and on device cache).",
   "setting_image_viewer_original_title": "Load original image",
diff --git a/web/src/lib/components/asset-viewer/actions/action.ts b/web/src/lib/components/asset-viewer/actions/action.ts
index fd37d253aa..d823f17df4 100644
--- a/web/src/lib/components/asset-viewer/actions/action.ts
+++ b/web/src/lib/components/asset-viewer/actions/action.ts
@@ -1,6 +1,6 @@
 import type { AssetAction } from '$lib/constants';
 import type { TimelineAsset } from '$lib/managers/timeline-manager/types';
-import type { AlbumResponseDto } from '@immich/sdk';
+import type { AlbumResponseDto, StackResponseDto } from '@immich/sdk';
 
 type ActionMap = {
   [AssetAction.ARCHIVE]: { asset: TimelineAsset };
@@ -14,6 +14,7 @@ type ActionMap = {
   [AssetAction.ADD_TO_ALBUM]: { asset: TimelineAsset; album: AlbumResponseDto };
   [AssetAction.UNSTACK]: { assets: TimelineAsset[] };
   [AssetAction.KEEP_THIS_DELETE_OTHERS]: { asset: TimelineAsset };
+  [AssetAction.SET_STACK_PRIMARY_ASSET]: { stack: StackResponseDto };
   [AssetAction.SET_VISIBILITY_LOCKED]: { asset: TimelineAsset };
   [AssetAction.SET_VISIBILITY_TIMELINE]: { asset: TimelineAsset };
 };
diff --git a/web/src/lib/components/asset-viewer/actions/set-stack-primary-asset.svelte b/web/src/lib/components/asset-viewer/actions/set-stack-primary-asset.svelte
new file mode 100644
index 0000000000..6ca1548f4b
--- /dev/null
+++ b/web/src/lib/components/asset-viewer/actions/set-stack-primary-asset.svelte
@@ -0,0 +1,26 @@
+<script lang="ts">
+  import MenuOption from '$lib/components/shared-components/context-menu/menu-option.svelte';
+
+  import { AssetAction } from '$lib/constants';
+  import { updateStack, type AssetResponseDto, type StackResponseDto } from '@immich/sdk';
+  import { mdiImageCheckOutline } from '@mdi/js';
+  import { t } from 'svelte-i18n';
+  import type { OnAction } from './action';
+
+  interface Props {
+    stack: StackResponseDto;
+    asset: AssetResponseDto;
+    onAction: OnAction;
+  }
+
+  let { stack, asset, onAction }: Props = $props();
+
+  const handleSetPrimaryAsset = async () => {
+    const updatedStack = await updateStack({ id: stack.id, stackUpdateDto: { primaryAssetId: asset.id } });
+    if (updatedStack) {
+      onAction({ type: AssetAction.SET_STACK_PRIMARY_ASSET, stack: updatedStack });
+    }
+  };
+</script>
+
+<MenuOption icon={mdiImageCheckOutline} onClick={handleSetPrimaryAsset} text={$t('set_stack_primary_asset')} />
diff --git a/web/src/lib/components/asset-viewer/asset-viewer-nav-bar.svelte b/web/src/lib/components/asset-viewer/asset-viewer-nav-bar.svelte
index e562f60319..a376c37139 100644
--- a/web/src/lib/components/asset-viewer/asset-viewer-nav-bar.svelte
+++ b/web/src/lib/components/asset-viewer/asset-viewer-nav-bar.svelte
@@ -13,6 +13,7 @@
   import SetAlbumCoverAction from '$lib/components/asset-viewer/actions/set-album-cover-action.svelte';
   import SetFeaturedPhotoAction from '$lib/components/asset-viewer/actions/set-person-featured-action.svelte';
   import SetProfilePictureAction from '$lib/components/asset-viewer/actions/set-profile-picture-action.svelte';
+  import SetStackPrimaryAsset from '$lib/components/asset-viewer/actions/set-stack-primary-asset.svelte';
   import SetVisibilityAction from '$lib/components/asset-viewer/actions/set-visibility-action.svelte';
   import ShareAction from '$lib/components/asset-viewer/actions/share-action.svelte';
   import ShowDetailAction from '$lib/components/asset-viewer/actions/show-detail-action.svelte';
@@ -192,6 +193,9 @@
           {#if stack}
             <UnstackAction {stack} {onAction} />
             <KeepThisDeleteOthersAction {stack} {asset} {onAction} />
+            {#if stack?.primaryAssetId !== asset.id}
+              <SetStackPrimaryAsset {stack} {asset} {onAction} />
+            {/if}
           {/if}
           {#if album}
             <SetAlbumCoverAction {asset} {album} />
diff --git a/web/src/lib/components/asset-viewer/asset-viewer.svelte b/web/src/lib/components/asset-viewer/asset-viewer.svelte
index e5d2554e2c..a448f96c32 100644
--- a/web/src/lib/components/asset-viewer/asset-viewer.svelte
+++ b/web/src/lib/components/asset-viewer/asset-viewer.svelte
@@ -338,7 +338,10 @@
         await handleGetAllAlbums();
         break;
       }
-
+      case AssetAction.SET_STACK_PRIMARY_ASSET: {
+        stack = action.stack;
+        break;
+      }
       case AssetAction.KEEP_THIS_DELETE_OTHERS:
       case AssetAction.UNSTACK: {
         closeViewer();
diff --git a/web/src/lib/components/photos-page/asset-grid.svelte b/web/src/lib/components/photos-page/asset-grid.svelte
index dec0c0096c..1b96353d37 100644
--- a/web/src/lib/components/photos-page/asset-grid.svelte
+++ b/web/src/lib/components/photos-page/asset-grid.svelte
@@ -31,7 +31,7 @@
   import { deleteAssets, updateStackedAssetInTimeline, updateUnstackedAssetInTimeline } from '$lib/utils/actions';
   import { archiveAssets, cancelMultiselect, selectAllAssets, stackAssets } from '$lib/utils/asset-utils';
   import { navigate } from '$lib/utils/navigation';
-  import { type ScrubberListener, type TimelinePlainYearMonth } from '$lib/utils/timeline-util';
+  import { toTimelineAsset, type ScrubberListener, type TimelinePlainYearMonth } from '$lib/utils/timeline-util';
   import { AssetVisibility, getAssetInfo, type AlbumResponseDto, type PersonResponseDto } from '@immich/sdk';
   import { DateTime } from 'luxon';
   import { onMount, type Snippet } from 'svelte';
@@ -511,6 +511,20 @@
         updateUnstackedAssetInTimeline(assetStore, action.assets);
         break;
       }
+      case AssetAction.SET_STACK_PRIMARY_ASSET: {
+        //Have to unstack then restack assets in timeline in order for the currently removed new primary asset to be made visible.
+        updateUnstackedAssetInTimeline(
+          assetStore,
+          action.stack.assets.map((asset) => toTimelineAsset(asset)),
+        );
+        updateStackedAssetInTimeline(assetStore, {
+          stack: action.stack,
+          toDeleteIds: action.stack.assets
+            .filter((asset) => asset.id !== action.stack.primaryAssetId)
+            .map((asset) => asset.id),
+        });
+        break;
+      }
     }
   };
 
diff --git a/web/src/lib/constants.ts b/web/src/lib/constants.ts
index ae53b4e7f3..c27727d4b3 100644
--- a/web/src/lib/constants.ts
+++ b/web/src/lib/constants.ts
@@ -10,6 +10,7 @@ export enum AssetAction {
   ADD_TO_ALBUM = 'add-to-album',
   UNSTACK = 'unstack',
   KEEP_THIS_DELETE_OTHERS = 'keep-this-delete-others',
+  SET_STACK_PRIMARY_ASSET = 'set-stack-primary-asset',
   SET_VISIBILITY_LOCKED = 'set-visibility-locked',
   SET_VISIBILITY_TIMELINE = 'set-visibility-timeline',
 }