diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index d0638dd..ec25326 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -7,6 +7,7 @@ import ConfigEditor from './pages/ConfigEditor'
 import Modlists from './pages/Modlists'
 import ModlistEditor from './pages/ModlistEditor'
 import Logs from './pages/Logs'
+import Mods from './pages/Mods'
 
 function App() {
   return (
@@ -18,6 +19,7 @@ function App() {
         <Route path="/configs/:name" element={<ConfigEditor />} />
         <Route path="/modlists" element={<Modlists />} />
         <Route path="/modlists/:id" element={<ModlistEditor />} />
+        <Route path="/mods" element={<Mods />} />
         <Route path="/logs" element={<Logs />} />
         <Route path="*" element={<Navigate to="/" replace />} />
       </Routes>
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index 4967e76..011c45d 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -1,4 +1,4 @@
-import type { ServerSettings, ServerPaths, ConfigInfo, Modlist, ModlistListItem, ModEntry } from '../types'
+import type { ServerSettings, ServerPaths, ConfigInfo, Modlist, ModlistListItem, ModEntry, ModInfo } from '../types'
 
 const BASE = '/api'
 
@@ -82,6 +82,12 @@ export const steamcmdApi = {
   status: () => request<{ running: boolean }>('/server/steamcmd/status'),
 }
 
+export const modsApi = {
+  list: () => request<ModInfo[]>('/mods'),
+  remove: (path: string) => request<void>('/mods', { method: 'DELETE', body: JSON.stringify({ path }) }),
+  cleanup: () => request<{ deleted: number }>('/mods/cleanup', { method: 'POST' }),
+}
+
 export const logsApi = {
   list: () => request<string[]>('/server/logs'),
   get: (file: string) => fetch(`${BASE}/server/logs/${file}`).then(r => r.text()),
diff --git a/frontend/src/components/Layout.tsx b/frontend/src/components/Layout.tsx
index 3a6db62..5f08575 100644
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -6,6 +6,7 @@ const nav = [
   { to: '/settings', label: 'Settings', icon: '🖥' },
   { to: '/configs', label: 'Configs', icon: '⚙' },
   { to: '/modlists', label: 'Modlists', icon: '📦' },
+  { to: '/mods', label: 'Mods', icon: '🗂' },
   { to: '/logs', label: 'Logs', icon: '📋' },
 ]
 
diff --git a/frontend/src/pages/Mods.tsx b/frontend/src/pages/Mods.tsx
new file mode 100644
index 0000000..27b8c3a
--- /dev/null
+++ b/frontend/src/pages/Mods.tsx
@@ -0,0 +1,131 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { modsApi } from '../api/client'
+import { useState } from 'react'
+
+function fmtSize(bytes: number): string {
+  if (bytes === 0) return '0 B'
+  const units = ['B', 'KB', 'MB', 'GB', 'TB']
+  const i = Math.floor(Math.log(bytes) / Math.log(1024))
+  const v = bytes / Math.pow(1024, i)
+  return `${v.toFixed(i > 0 ? 1 : 0)} ${units[i]}`
+}
+
+export default function Mods() {
+  const qc = useQueryClient()
+  const [search, setSearch] = useState('')
+  const [confirmDelete, setConfirmDelete] = useState<string | null>(null)
+
+  const { data: mods, isLoading } = useQuery({ queryKey: ['mods'], queryFn: modsApi.list })
+
+  const deleteMut = useMutation({
+    mutationFn: (path: string) => modsApi.remove(path),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ['mods'] }),
+  })
+
+  const cleanupMut = useMutation({
+    mutationFn: () => modsApi.cleanup(),
+    onSuccess: (data) => {
+      qc.invalidateQueries({ queryKey: ['mods'] })
+      alert(`Deleted ${data.deleted} orphaned mod(s)`)
+    },
+  })
+
+  const orphaned = mods?.filter(m => !m.in_use) ?? []
+  const filtered = mods?.filter(m => {
+    if (!search) return true
+    const q = search.toLowerCase()
+    return m.id.toLowerCase().includes(q) || m.name.toLowerCase().includes(q) || m.source.toLowerCase().includes(q)
+  })
+
+  const handleDelete = (path: string) => {
+    if (window.confirm('Delete this mod from disk? This cannot be undone.')) {
+      deleteMut.mutate(path)
+    }
+    setConfirmDelete(null)
+  }
+
+  const handleCleanup = () => {
+    const count = orphaned.length
+    if (count === 0) return
+    if (window.confirm(`Delete all ${count} orphaned mod(s) from disk? This cannot be undone.`)) {
+      cleanupMut.mutate()
+    }
+  }
+
+  if (isLoading) return <p className="text-neutral-500">Loading...</p>
+
+  return (
+    <div>
+      <div className="flex items-center justify-between mb-6">
+        <h2 className="text-2xl font-semibold">Installed Mods</h2>
+        <button
+          onClick={handleCleanup}
+          disabled={orphaned.length === 0 || cleanupMut.isPending}
+          className="px-4 py-2 bg-red-700 hover:bg-red-600 disabled:opacity-50 rounded text-sm"
+        >
+          {cleanupMut.isPending ? 'Deleting...' : `Delete All Orphaned (${orphaned.length})`}
+        </button>
+      </div>
+
+      <input
+        value={search}
+        onChange={e => setSearch(e.target.value)}
+        placeholder="Filter by name or ID..."
+        className="w-full bg-neutral-800 border border-neutral-700 rounded px-3 py-2 text-sm mb-4"
+      />
+
+      <div className="overflow-x-auto">
+        <table className="w-full text-sm">
+          <thead>
+            <tr className="text-neutral-500 border-b border-neutral-800 text-left">
+              <th className="pb-2 pr-4">Name</th>
+              <th className="pb-2 pr-4">Source</th>
+              <th className="pb-2 pr-4 text-right">Size</th>
+              <th className="pb-2 pr-4">Status</th>
+              <th className="pb-2 pr-4">Modlists</th>
+              <th className="pb-2"></th>
+            </tr>
+          </thead>
+          <tbody>
+            {filtered?.map((m, i) => (
+              <tr key={i} className="border-b border-neutral-800/50 hover:bg-neutral-900/50">
+                <td className="py-2 pr-4 font-mono text-sm">
+                  {m.name || m.id}
+                  {!m.name && m.source === 'workshop' && (
+                    <span className="text-neutral-600 ml-1">({m.id})</span>
+                  )}
+                </td>
+                <td className="py-2 pr-4">
+                  <span className={`text-xs px-2 py-0.5 rounded ${m.source === 'workshop' ? 'bg-blue-900 text-blue-300' : 'bg-green-900 text-green-300'}`}>
+                    {m.source}
+                  </span>
+                </td>
+                <td className="py-2 pr-4 text-right text-neutral-400">{fmtSize(m.size)}</td>
+                <td className="py-2 pr-4">
+                  <span className={`text-xs px-2 py-0.5 rounded ${m.in_use ? 'bg-green-900 text-green-300' : 'bg-red-900 text-red-300'}`}>
+                    {m.in_use ? 'Used' : 'Orphaned'}
+                  </span>
+                </td>
+                <td className="py-2 pr-4 text-neutral-400 text-xs max-w-xs truncate">
+                  {m.modlists.length > 0 ? m.modlists.join(', ') : '-'}
+                </td>
+                <td className="py-2">
+                  <button
+                    onClick={() => handleDelete(m.path)}
+                    disabled={deleteMut.isPending && confirmDelete === m.path}
+                    className="text-xs text-red-400 hover:text-red-300 disabled:opacity-50"
+                  >
+                    Delete
+                  </button>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+        {filtered?.length === 0 && (
+          <p className="text-neutral-600 text-sm mt-4">No mods found.</p>
+        )}
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index fd3efa0..d943463 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -50,3 +50,13 @@ export interface ServerPaths {
   cfg_dir: string
   profiles_dir: string
 }
+
+export interface ModInfo {
+  id: string
+  name: string
+  source: 'workshop' | 'local'
+  path: string
+  size: number
+  in_use: boolean
+  modlists: string[]
+}