diff --git a/client/src/pages/admin/Admin.scss b/client/src/pages/admin/Admin.scss
index f428cee..3c43866 100644
--- a/client/src/pages/admin/Admin.scss
+++ b/client/src/pages/admin/Admin.scss
@@ -262,3 +262,30 @@
     color: var(--danger);
   }
 }
+
+// Clickable table sort headers
+.admin-sort-th {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0;
+  margin: 0;
+  border: 0;
+  background: none;
+  color: inherit;
+  font: inherit;
+  font-weight: inherit;
+  letter-spacing: inherit;
+  text-transform: inherit;
+  cursor: pointer;
+  user-select: none;
+
+  &:hover {
+    color: var(--accent);
+  }
+
+  &:focus-visible {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+  }
+}
diff --git a/client/src/pages/admin/AdminCategories.tsx b/client/src/pages/admin/AdminCategories.tsx
index 682f10b..6672895 100644
--- a/client/src/pages/admin/AdminCategories.tsx
+++ b/client/src/pages/admin/AdminCategories.tsx
@@ -20,6 +20,8 @@ export function AdminCategories() {
   const [tagQuery, setTagQuery] = useState("");
   const [tagFilter, setTagFilter] = useState<"all" | "used" | "unused">("all");
   const [tagPage, setTagPage] = useState(1);
+  const [sortKey, setSortKey] = useState<"name" | "slug" | "projects">("projects");
+  const [sortDir, setSortDir] = useState<"asc" | "desc">("desc");
 
   usePageTitle("Categories & Tags · Admin");
 
@@ -32,13 +34,29 @@ export function AdminCategories() {
     load();
   }, []);
 
-  // Reset page when filters change
+  // Reset page when filters/sort change
   useEffect(() => {
     setTagPage(1);
-  }, [tagQuery, tagFilter]);
+  }, [tagQuery, tagFilter, sortKey, sortDir]);
+
+  function toggleSort(key: "name" | "slug" | "projects") {
+    if (sortKey === key) {
+      setSortDir((d) => (d === "asc" ? "desc" : "asc"));
+    } else {
+      setSortKey(key);
+      // Projects default to high→low; name/slug A→Z
+      setSortDir(key === "projects" ? "desc" : "asc");
+    }
+  }
+
+  function sortLabel(key: "name" | "slug" | "projects", label: string) {
+    if (sortKey !== key) return label;
+    return `${label} ${sortDir === "asc" ? "↑" : "↓"}`;
+  }
 
   const filteredTags = useMemo(() => {
     const q = tagQuery.trim().toLowerCase();
+    const dir = sortDir === "asc" ? 1 : -1;
     return tags
       .filter((t) => {
         if (q && !t.name.toLowerCase().includes(q) && !t.slug.toLowerCase().includes(q)) {
@@ -50,13 +68,22 @@ export function AdminCategories() {
         return true;
       })
       .sort((a, b) => {
-        // Used first by count desc, then name
-        const ua = tagUsage(a);
-        const ub = tagUsage(b);
-        if (ua !== ub) return ub - ua;
-        return a.name.localeCompare(b.name);
+        if (sortKey === "projects") {
+          const diff = tagUsage(a) - tagUsage(b);
+          if (diff !== 0) return diff * dir;
+          return a.name.localeCompare(b.name);
+        }
+        if (sortKey === "slug") {
+          const diff = a.slug.localeCompare(b.slug);
+          if (diff !== 0) return diff * dir;
+          return a.name.localeCompare(b.name);
+        }
+        // name
+        const diff = a.name.localeCompare(b.name);
+        if (diff !== 0) return diff * dir;
+        return tagUsage(b) - tagUsage(a);
       });
-  }, [tags, tagQuery, tagFilter]);
+  }, [tags, tagQuery, tagFilter, sortKey, sortDir]);
 
   const totalPages = Math.max(1, Math.ceil(filteredTags.length / PAGE_SIZE));
   const page = Math.min(tagPage, totalPages);
@@ -232,9 +259,46 @@ export function AdminCategories() {
       <table className="admin-table">
         <thead>
           <tr>
-            <th>Name</th>
-            <th>Slug</th>
-            <th>Projects</th>
+            <th>
+              <button
+                type="button"
+                className="admin-sort-th"
+                onClick={() => toggleSort("name")}
+                aria-sort={
+                  sortKey === "name" ? (sortDir === "asc" ? "ascending" : "descending") : "none"
+                }
+              >
+                {sortLabel("name", "Name")}
+              </button>
+            </th>
+            <th>
+              <button
+                type="button"
+                className="admin-sort-th"
+                onClick={() => toggleSort("slug")}
+                aria-sort={
+                  sortKey === "slug" ? (sortDir === "asc" ? "ascending" : "descending") : "none"
+                }
+              >
+                {sortLabel("slug", "Slug")}
+              </button>
+            </th>
+            <th>
+              <button
+                type="button"
+                className="admin-sort-th"
+                onClick={() => toggleSort("projects")}
+                aria-sort={
+                  sortKey === "projects"
+                    ? sortDir === "asc"
+                      ? "ascending"
+                      : "descending"
+                    : "none"
+                }
+              >
+                {sortLabel("projects", "Projects")}
+              </button>
+            </th>
             <th></th>
           </tr>
         </thead>