diff --git a/backend/main.py b/backend/main.py
index 08db882..eaa6e0a 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -1929,6 +1929,19 @@ async def restore_backup(
     return {"restored": filename, "auto_backup": auto_dst.name if src.exists() else None}
 
 
+@app.delete("/api/admin/backup/{filename}")
+async def delete_backup(
+    filename: str,
+    current_user: User = Depends(get_current_admin),
+):
+    """Delete a backup file."""
+    fp = BACKUP_DIR / filename
+    if not fp.exists() or ".." in filename:
+        raise HTTPException(status_code=404, detail="Backup not found")
+    fp.unlink()
+    return {"deleted": filename}
+
+
 @app.post("/api/admin/reset/{section}")
 async def reset_section(
     section: str,
diff --git a/frontend/src/pages/Settings.jsx b/frontend/src/pages/Settings.jsx
index 81651bd..42f99c2 100644
--- a/frontend/src/pages/Settings.jsx
+++ b/frontend/src/pages/Settings.jsx
@@ -218,6 +218,22 @@ export default function Settings() {
                   >
                     <Upload className="w-3.5 h-3.5" /> 還原
                   </button>
+                  <button
+                    onClick={async () => {
+                      if (!confirm(`確定要刪除 ${b.filename}？`)) return
+                      try {
+                        await api.delete(`/api/admin/backup/${b.filename}`)
+                        toast.success(`已刪除 ${b.filename}`)
+                        fetchBackups()
+                      } catch (e) {
+                        toast.error("刪除失敗: " + (e.response?.data?.detail || e.message))
+                      }
+                    }}
+                    className="flex items-center gap-1 px-3 py-1.5 text-xs font-medium text-red-500 hover:text-red-700 hover:bg-red-50 rounded-md transition-colors"
+                    title="Delete backup"
+                  >
+                    <Trash2 className="w-3.5 h-3.5" /> 刪除
+                  </button>
                 </div>
               </div>
             ))