diff --git a/src/components/ExternalContentHeader.tsx b/src/components/ExternalContentHeader.tsx
index 9ce381e4..099c6fd0 100644
--- a/src/components/ExternalContentHeader.tsx
+++ b/src/components/ExternalContentHeader.tsx
@@ -11,7 +11,7 @@ import { LinkEmbed } from '@/components/LinkEmbed';
 import { ReplyComposeModal } from '@/components/ReplyComposeModal';
 import { WikipediaIcon } from '@/components/icons/WikipediaIcon';
 import { BlueskyIcon } from '@/components/icons/BlueskyIcon';
-import { extractYouTubeId, extractWikipediaTitle, extractBlueskyPost } from '@/lib/linkEmbed';
+import { extractYouTubeId, extractWikipediaTitle, extractWikidataId, extractBlueskyPost } from '@/lib/linkEmbed';
 import { parseExternalUri, formatIsbn } from '@/lib/externalContent';
 import { shareOrCopy } from '@/lib/share';
 import { useLinkPreview } from '@/hooks/useLinkPreview';
@@ -26,6 +26,7 @@ import { useShareOrigin } from '@/hooks/useShareOrigin';
 import { genUserName } from '@/lib/genUserName';
 import { getCountryInfo, getWikipediaTitle } from '@/lib/countries';
 import { useWikipediaSummary } from '@/hooks/useWikipediaSummary';
+import { useWikidataEntity } from '@/hooks/useWikidataEntity';
 import { EXTRA_KINDS } from '@/lib/extraKinds';
 import { CONTENT_KIND_ICONS } from '@/lib/sidebarItems';
 import { cn } from '@/lib/utils';
@@ -36,12 +37,17 @@ import { cn } from '@/lib/utils';
 
 export function UrlContentHeader({ url }: { url: string }) {
   const wikiTitle = useMemo(() => extractWikipediaTitle(url), [url]);
+  const wikidataId = useMemo(() => extractWikidataId(url), [url]);
   const blueskyPost = useMemo(() => extractBlueskyPost(url), [url]);
 
   if (wikiTitle) {
     return <WikipediaArticleHeader title={wikiTitle} url={url} />;
   }
 
+  if (wikidataId) {
+    return <WikidataEntityHeader id={wikidataId} url={url} />;
+  }
+
   if (blueskyPost) {
     return <BlueskyPostHeader author={blueskyPost.author} rkey={blueskyPost.rkey} url={url} />;
   }
@@ -49,6 +55,40 @@ export function UrlContentHeader({ url }: { url: string }) {
   return <LinkEmbed url={url} showActions={false} />;
 }
 
+// ---------------------------------------------------------------------------
+// Wikidata entity header — resolves the entity to its Wikipedia article and
+// delegates to WikipediaArticleHeader. Falls back to LinkEmbed when there is
+// no English Wikipedia sitelink (or while resolving fails).
+// ---------------------------------------------------------------------------
+
+function WikidataEntityHeader({ id, url }: { id: string; url: string }) {
+  const { data: entity, isLoading } = useWikidataEntity(id);
+
+  if (isLoading) {
+    return (
+      <div className="rounded-2xl border border-border overflow-hidden">
+        <Skeleton className="w-full aspect-[16/9]" />
+        <div className="p-5 space-y-3">
+          <Skeleton className="h-3 w-24" />
+          <Skeleton className="h-7 w-3/4" />
+          <Skeleton className="h-4 w-1/2" />
+          <div className="space-y-2 pt-2">
+            <Skeleton className="h-4 w-full" />
+            <Skeleton className="h-4 w-full" />
+            <Skeleton className="h-4 w-3/4" />
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  if (entity?.wikipediaTitle && entity.wikipediaUrl) {
+    return <WikipediaArticleHeader title={entity.wikipediaTitle} url={entity.wikipediaUrl} />;
+  }
+
+  return <LinkEmbed url={url} showActions={false} />;
+}
+
 // ---------------------------------------------------------------------------
 // Bluesky post header (full feed-style, like a thread top post)
 // ---------------------------------------------------------------------------
diff --git a/src/hooks/useWikidataEntity.ts b/src/hooks/useWikidataEntity.ts
new file mode 100644
index 00000000..31c31dd5
--- /dev/null
+++ b/src/hooks/useWikidataEntity.ts
@@ -0,0 +1,67 @@
+import { useQuery } from '@tanstack/react-query';
+
+export interface WikidataEntity {
+  /** The Wikidata entity ID (e.g. "Q42"). */
+  id: string;
+  /**
+   * English Wikipedia article title for this entity, if one exists.
+   * Derived from the `enwiki` sitelink.
+   */
+  wikipediaTitle: string | null;
+  /**
+   * Full URL to the English Wikipedia article for this entity, if one exists.
+   * Derived from the `enwiki` sitelink URL.
+   */
+  wikipediaUrl: string | null;
+}
+
+async function fetchWikidataEntity(
+  id: string,
+  signal?: AbortSignal,
+): Promise<WikidataEntity | null> {
+  try {
+    // Use the Action API with CORS-friendly origin=* and minimal props.
+    // We only need the English Wikipedia sitelink to resolve to a Wikipedia article.
+    const url = new URL('https://www.wikidata.org/w/api.php');
+    url.searchParams.set('action', 'wbgetentities');
+    url.searchParams.set('ids', id);
+    url.searchParams.set('props', 'sitelinks/urls');
+    url.searchParams.set('sitefilter', 'enwiki');
+    url.searchParams.set('format', 'json');
+    url.searchParams.set('origin', '*');
+
+    const response = await fetch(url.toString(), {
+      signal,
+      headers: { Accept: 'application/json' },
+    });
+
+    if (!response.ok) return null;
+
+    const data = await response.json();
+    const entity = data?.entities?.[id];
+    if (!entity || entity.missing !== undefined) return null;
+
+    const enwiki = entity.sitelinks?.enwiki;
+    const wikipediaTitle = typeof enwiki?.title === 'string' ? enwiki.title : null;
+    const wikipediaUrl = typeof enwiki?.url === 'string' ? enwiki.url : null;
+
+    return { id, wikipediaTitle, wikipediaUrl };
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Resolve a Wikidata entity ID (e.g. "Q42") to its English Wikipedia article, if any.
+ * Uses the Wikidata Action API `wbgetentities` endpoint with `sitefilter=enwiki`.
+ */
+export function useWikidataEntity(id: string | null) {
+  return useQuery({
+    queryKey: ['wikidata-entity', id],
+    queryFn: ({ signal }) => fetchWikidataEntity(id!, signal),
+    enabled: !!id,
+    staleTime: 1000 * 60 * 60 * 24, // 24 hours
+    gcTime: 1000 * 60 * 60 * 24 * 7, // 7 days
+    retry: 1,
+  });
+}
diff --git a/src/lib/linkEmbed.ts b/src/lib/linkEmbed.ts
index e83313dc..d1d74842 100644
--- a/src/lib/linkEmbed.ts
+++ b/src/lib/linkEmbed.ts
@@ -125,6 +125,29 @@ export function extractArchiveOrgId(url: string): string | null {
   }
 }
 
+/**
+ * Extract a Wikidata entity ID (Q…, P…, or L…) from a Wikidata URL, or null if not one.
+ *
+ * Supports the "globally unique" concept URI form described at
+ * https://www.wikidata.org/wiki/Wikidata:Identifiers:
+ *   - https://www.wikidata.org/entity/Q42
+ *   - http://www.wikidata.org/entity/Q42
+ * …as well as the browser-facing page URL:
+ *   - https://www.wikidata.org/wiki/Q42
+ */
+export function extractWikidataId(url: string): string | null {
+  try {
+    const u = new URL(url);
+    const host = u.hostname.replace(/^www\./, '');
+    if (host !== 'wikidata.org') return null;
+    // Match /entity/{id} or /wiki/{id} where id is Q|P|L followed by digits.
+    const match = u.pathname.match(/^\/(?:entity|wiki)\/([QPL]\d+)$/);
+    return match ? match[1] : null;
+  } catch {
+    return null;
+  }
+}
+
 /**
  * Extract a Wikipedia article title from a Wikipedia URL, or null if not a Wikipedia article link.
  * Supports en.wikipedia.org/wiki/{title} and other language subdomains.
diff --git a/src/pages/ExternalContentPage.tsx b/src/pages/ExternalContentPage.tsx
index a6b5108e..b0426352 100644
--- a/src/pages/ExternalContentPage.tsx
+++ b/src/pages/ExternalContentPage.tsx
@@ -38,10 +38,11 @@ import { useLayoutOptions } from '@/contexts/LayoutContext';
 import { useCurrentUser } from '@/hooks/useCurrentUser';
 import { useFeedSettings } from '@/hooks/useFeedSettings';
 import { useWikipediaSummary } from '@/hooks/useWikipediaSummary';
+import { useWikidataEntity } from '@/hooks/useWikidataEntity';
 import { useToast } from '@/hooks/useToast';
 import { getDisplayName } from '@/lib/getDisplayName';
 import { timeAgo } from '@/lib/timeAgo';
-import { extractWikipediaTitle } from '@/lib/linkEmbed';
+import { extractWikipediaTitle, extractWikidataId } from '@/lib/linkEmbed';
 import { cn } from '@/lib/utils';
 import type { NostrEvent } from '@nostrify/nostrify';
 import type { BookReview } from '@/lib/bookstr';
@@ -170,7 +171,12 @@ export function ExternalContentPage() {
   const { data: linkPreview } = useLinkPreview(linkPreviewUrl);
 
   // For Wikipedia URLs, use the Wikipedia API for accurate titles.
-  const wikiTitle = useMemo(() => linkPreviewUrl ? extractWikipediaTitle(linkPreviewUrl) : null, [linkPreviewUrl]);
+  // For Wikidata URLs, resolve the entity's English Wikipedia sitelink and fall through
+  // to the Wikipedia branch so the page title and back-link behave identically.
+  const directWikiTitle = useMemo(() => linkPreviewUrl ? extractWikipediaTitle(linkPreviewUrl) : null, [linkPreviewUrl]);
+  const wikidataId = useMemo(() => linkPreviewUrl ? extractWikidataId(linkPreviewUrl) : null, [linkPreviewUrl]);
+  const { data: wikidataEntity } = useWikidataEntity(directWikiTitle ? null : wikidataId);
+  const wikiTitle = directWikiTitle ?? wikidataEntity?.wikipediaTitle ?? null;
   const { data: wikiSummary } = useWikipediaSummary(wikiTitle);
   const resolvedTitle = wikiSummary?.title ?? linkPreview?.title;