diff --git a/app/Http/Controllers/Backend/WikiReadOnlyController.php b/app/Http/Controllers/Backend/WikiReadOnlyController.php
new file mode 100644
index 00000000..0fae6196
--- /dev/null
+++ b/app/Http/Controllers/Backend/WikiReadOnlyController.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Controllers\Backend;
+
+use App\Http\Controllers\Controller;
+use App\Wiki;
+use Illuminate\Http\Request;
+
+class WikiReadOnlyController extends Controller {
+    public function setWikiReadOnly(Request $request) {
+
+        $validated = $request->validate([
+            'domain' => 'required|string',
+            'readOnly' => 'required|boolean',
+        ]);
+
+        $domain = $validated['domain'];
+        $readOnly = $validated['readOnly'];
+
+        $wiki = Wiki::where('domain', $domain)->first();
+        if (!$wiki) {
+            return response()->json([
+                'error' => "Wiki not found for domain '$domain'",
+            ], 404);
+        }
+
+        if ($readOnly) {
+            $wiki->setSetting('wgReadOnly', 'This wiki is currently read-only.');
+
+            return response()->json([
+                'success' => true,
+                'domain' => $domain,
+                'message' => 'Wiki set to read-only successfully.',
+            ]);
+        } else {
+            $wiki->deleteSetting('wgReadOnly');
+
+            return response()->json([
+                'success' => true,
+                'domain' => $domain,
+                'message' => 'Read-only setting successfully removed for wiki.',
+            ]);
+        }
+    }
+}
diff --git a/app/Wiki.php b/app/Wiki.php
index 109c5588..8807653f 100644
--- a/app/Wiki.php
+++ b/app/Wiki.php
@@ -159,4 +159,15 @@ public function getDomainDecodedAttribute(): string {
     public function wikiLatestProfile() {
         return $this->hasOne(WikiProfile::class)->latestOfMany();
     }
+
+    public function setSetting(string $name, string $value): void {
+        $this->settings()->updateOrCreate(
+            ['name' => $name],
+            ['value' => $value]
+        );
+    }
+
+    public function deleteSetting(string $name): ?string {
+        return $this->settings()->where('name', $name)->delete();
+    }
 }
diff --git a/routes/backend.php b/routes/backend.php
index 478a4036..b1499068 100644
--- a/routes/backend.php
+++ b/routes/backend.php
@@ -10,6 +10,8 @@
 // GET
 $router->get('healthz', fn () => "It's Alive");
 $router->get('getWikiHostsForDomain', ['uses' => 'MediaWikiHostsController@getWikiHostsForDomain']);
+// PUT
+$router->put('setWikiReadOnly', ['uses' => 'WikiReadOnlyController@setWikiReadOnly']);
 
 $router->group(['prefix' => 'ingress'], function () use ($router) {
     // GET
diff --git a/tests/Routes/Backend/WikiReadOnlyControllerTest.php b/tests/Routes/Backend/WikiReadOnlyControllerTest.php
new file mode 100644
index 00000000..2f531dd0
--- /dev/null
+++ b/tests/Routes/Backend/WikiReadOnlyControllerTest.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests\Routes\Backend;
+
+use App\Wiki;
+use App\WikiSetting;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class WikiReadOnlyControllerTest extends TestCase {
+    use RefreshDatabase;
+
+    protected string $route = '/backend/setWikiReadOnly';
+
+    public function testItReturns404WhenWikiNotFound() {
+        $response = $this->putJson($this->route, [
+            'domain' => 'nonexistent.wikibase.cloud',
+            'readOnly' => true,
+        ]);
+
+        $response->assertStatus(404)
+            ->assertJson([
+                'error' => "Wiki not found for domain 'nonexistent.wikibase.cloud'",
+            ]);
+    }
+
+    public function testSetWikiToReadOnly() {
+        $wiki = Wiki::factory()->create([
+            'domain' => 'somewiki.wikibase.cloud',
+        ]);
+
+        $response = $this->putJson($this->route, [
+            'domain' => 'somewiki.wikibase.cloud',
+            'readOnly' => true,
+        ]);
+
+        $response->assertStatus(200)
+            ->assertJson([
+                'success' => true,
+                'domain' => 'somewiki.wikibase.cloud',
+                'message' => 'Wiki set to read-only successfully.',
+            ]);
+
+        $this->assertSame(
+            'This wiki is currently read-only.',
+            WikiSetting::whereWikiId($wiki->id)->whereName('wgReadOnly')->first()->value
+        );
+
+    }
+
+    public function testDeleteSettingForReadOnlyFalse() {
+        $wiki = Wiki::factory()->create([
+            'domain' => 'somewiki.wikibase.cloud',
+        ]);
+        $wiki->setSetting('wgReadOnly', 'test');
+
+        $this->putJson($this->route, [
+            'domain' => $wiki->domain,
+            'readOnly' => false,
+        ])
+            ->assertStatus(200)
+            ->assertJson(['message' => 'Read-only setting successfully removed for wiki.']);
+
+        $this->assertNull(
+            WikiSetting::whereWikiId($wiki->id)
+                ->whereName('wgReadOnly')
+                ->first(),
+        );
+    }
+}