diff --git c/core/modules/system/lib/Drupal/system/Controller/AdminController.php w/core/modules/system/lib/Drupal/system/Controller/AdminController.php
index 032eab0..cf78b69 100644
--- c/core/modules/system/lib/Drupal/system/Controller/AdminController.php
+++ w/core/modules/system/lib/Drupal/system/Controller/AdminController.php
@@ -55,8 +55,6 @@ public function index() {
       $module_info[$module]->info = $info;
     }
 
-    $this->moduleHandler->loadInclude('system', 'admin.inc');
-
     uasort($module_info, 'system_sort_modules_by_info_name');
     $menu_items = array();
 
diff --git c/core/modules/system/lib/Drupal/system/Controller/ThemeListingController.php w/core/modules/system/lib/Drupal/system/Controller/ThemeListingController.php
new file mode 100644
index 0000000..a470332
--- /dev/null
+++ w/core/modules/system/lib/Drupal/system/Controller/ThemeListingController.php
@@ -0,0 +1,201 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\system\Controller\ThemeListingController.
+ */
+
+namespace Drupal\system\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Access\CsrfTokenGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Controller for theme handling.
+ */
+class ThemeListingController extends ControllerBase implements ContainerInjectionInterface {
+
+  /**
+   * The token generator manager service.
+   *
+   * @var \Drupal\Core\Access\CsrfTokenGenerator
+   */
+  protected $tokenGenerator;
+
+  /**
+   * Constructs a ThemeListingController object.
+   *
+   * @param \Drupal\Core\Access\CsrfTokenGenerator
+   *  The Csrf token generator.
+   */
+  public function __construct(CsrfTokenGenerator $token_generator) {
+    $this->tokenGenerator = $token_generator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('csrf_token')
+    );
+  }
+
+  /**
+   * Returns a theme listing.
+   *
+   * @return string
+   *  A HTML string of the theme listing page.
+   */
+  public function listingPage() {
+    $config = $this->config('system.theme');
+    // Get current list of themes.
+    $themes = system_rebuild_theme_data();
+    uasort($themes, 'system_sort_modules_by_info_name');
+
+    $theme_default = $config->get('default');
+    $theme_groups  = array();
+    $admin_theme = $config->get('admin');
+
+    foreach ($themes as &$theme) {
+      if (!empty($theme->info['hidden'])) {
+        continue;
+      }
+      $theme->is_default = ($theme->name == $theme_default);
+
+      // Identify theme screenshot.
+      $theme->screenshot = NULL;
+      // Create a list which includes the current theme and all its base themes.
+      if (isset($themes[$theme->name]->base_themes)) {
+        $theme_keys = array_keys($themes[$theme->name]->base_themes);
+        $theme_keys[] = $theme->name;
+      }
+      else {
+        $theme_keys = array($theme->name);
+      }
+      // Look for a screenshot in the current theme or in its closest ancestor.
+      foreach (array_reverse($theme_keys) as $theme_key) {
+        if (isset($themes[$theme_key]) && file_exists($themes[$theme_key]->info['screenshot'])) {
+          $theme->screenshot = array(
+            'uri' => $themes[$theme_key]->info['screenshot'],
+            'alt' => $this->t('Screenshot for !theme theme', array('!theme' => $theme->info['name'])),
+            'title' => $this->t('Screenshot for !theme theme', array('!theme' => $theme->info['name'])),
+            'attributes' => array('class' => array('screenshot')),
+          );
+          break;
+        }
+      }
+
+      if (empty($theme->status)) {
+        // Ensure this theme is compatible with this version of core.
+        // Require the 'content' region to make sure the main page
+        // content has a common place in all themes.
+        $theme->incompatible_core = !isset($theme->info['core']) || ($theme->info['core'] != \DRUPAL::CORE_COMPATIBILITY) || !isset($theme->info['regions']['content']);
+        $theme->incompatible_php = version_compare(phpversion(), $theme->info['php']) < 0;
+        // Confirmed that the base theme is available.
+        $theme->incompatible_base = isset($theme->info['base theme']) && !isset($themes[$theme->info['base theme']]);
+        // Confirm that the theme engine is available.
+        $theme->incompatible_engine = isset($theme->info['engine']) && !isset($theme->owner);
+      }
+      $query['token'] = $this->tokenGenerator->get('system-theme-operation-link');
+      $theme->operations = array();
+      if (!empty($theme->status) || !$theme->incompatible_core && !$theme->incompatible_php && !$theme->incompatible_base && !$theme->incompatible_engine) {
+        // Create the operations links.
+        $query['theme'] = $theme->name;
+        if (drupal_theme_access($theme)) {
+          $theme->operations[] = array(
+            'title' => $this->t('Settings'),
+            'href' => 'admin/appearance/settings/' . $theme->name,
+            'attributes' => array('title' => $this->t('Settings for !theme theme', array('!theme' => $theme->info['name']))),
+          );
+        }
+        if (!empty($theme->status)) {
+          if (!$theme->is_default) {
+            if ($theme->name != $admin_theme) {
+              $theme->operations[] = array(
+                'title' => $this->t('Disable'),
+                'href' => 'admin/appearance/disable',
+                'query' => $query,
+                'attributes' => array('title' => $this->t('Disable !theme theme', array('!theme' => $theme->info['name']))),
+              );
+            }
+            $theme->operations[] = array(
+              'title' => $this->t('Set default'),
+              'href' => 'admin/appearance/default',
+              'query' => $query,
+              'attributes' => array('title' => $this->t('Set !theme as default theme', array('!theme' => $theme->info['name']))),
+            );
+          }
+          $admin_theme_options[$theme->name] = $theme->info['name'];
+        }
+        else {
+          $theme->operations[] = array(
+            'title' => $this->t('Enable'),
+            'href' => 'admin/appearance/enable',
+            'query' => $query,
+            'attributes' => array('title' => $this->t('Enable !theme theme', array('!theme' => $theme->info['name']))),
+          );
+          $theme->operations[] = array(
+            'title' => $this->t('Enable and set default'),
+            'href' => 'admin/appearance/default',
+            'query' => $query,
+            'attributes' => array('title' => $this->t('Enable !theme as default theme', array('!theme' => $theme->info['name']))),
+          );
+        }
+      }
+
+      // Add notes to default and administration theme.
+      $theme->notes = array();
+      $theme->classes = array();
+      if ($theme->is_default) {
+        $theme->classes[] = 'theme-default';
+        $theme->notes[] = $this->t('default theme');
+      }
+      if ($theme->name == $admin_theme || ($theme->is_default && $admin_theme == '0')) {
+        $theme->classes[] = 'theme-admin';
+        $theme->notes[] = $this->t('admin theme');
+      }
+
+      // Sort enabled and disabled themes into their own groups.
+      $theme_groups[$theme->status ? 'enabled' : 'disabled'][] = $theme;
+    }
+
+    // There are two possible theme groups.
+    $theme_group_titles = array(
+      'enabled' => format_plural(count($theme_groups['enabled']), 'Enabled theme', 'Enabled themes'),
+    );
+    if (!empty($theme_groups['disabled'])) {
+      $theme_group_titles['disabled'] = format_plural(count($theme_groups['disabled']), 'Disabled theme', 'Disabled themes');
+    }
+
+    uasort($theme_groups['enabled'], array($this, 'systemSortThemes'));
+    $this->moduleHandler()->alter('system_themes_page', $theme_groups);
+
+    $build = array();
+    $build[] = array(
+      '#theme' => 'system_themes_page',
+      '#theme_groups' => $theme_groups,
+      '#theme_group_titles' => $theme_group_titles,
+    );
+    $build[] = drupal_get_form('system_themes_admin_form', $admin_theme_options);
+
+    return $build;
+  }
+
+  /**
+   * Array sorting callback; sorts themes by their name.
+   */
+  protected static function systemSortThemes($a, $b) {
+    if ($a->is_default) {
+      return -1;
+    }
+    if ($b->is_default) {
+      return 1;
+    }
+    return strcasecmp($a->info['name'], $b->info['name']);
+  }
+
+}
diff --git c/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php w/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
index 2dec552..5486539 100644
--- c/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
+++ w/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
@@ -85,7 +85,6 @@ public function buildForm(array $form, array &$form_state) {
     $profile = drupal_get_profile();
 
     // Sort all modules by their name.
-    $this->moduleHandler->loadInclude('system', 'inc', 'system.admin');
     uasort($disabled, 'system_sort_modules_by_info_name');
 
     $form['uninstall'] = array('#tree' => TRUE);
diff --git c/core/modules/system/system.admin.inc w/core/modules/system/system.admin.inc
index 9db20be..d2491fd 100644
--- c/core/modules/system/system.admin.inc
+++ w/core/modules/system/system.admin.inc
@@ -11,171 +11,6 @@
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 
 /**
- * Menu callback; displays a listing of all themes.
- */
-function system_themes_page() {
-  // Get current list of themes.
-  $themes = system_rebuild_theme_data();
-  uasort($themes, 'system_sort_modules_by_info_name');
-
-  $theme_default = Drupal::config('system.theme')->get('default');
-  $theme_groups  = array();
-  $admin_theme = Drupal::config('system.theme')->get('admin');
-
-  foreach ($themes as &$theme) {
-    if (!empty($theme->info['hidden'])) {
-      continue;
-    }
-    $theme->is_default = ($theme->name == $theme_default);
-
-    // Identify theme screenshot.
-    $theme->screenshot = NULL;
-    // Create a list which includes the current theme and all its base themes.
-    if (isset($themes[$theme->name]->base_themes)) {
-      $theme_keys = array_keys($themes[$theme->name]->base_themes);
-      $theme_keys[] = $theme->name;
-    }
-    else {
-      $theme_keys = array($theme->name);
-    }
-    // Look for a screenshot in the current theme or in its closest ancestor.
-    foreach (array_reverse($theme_keys) as $theme_key) {
-      if (isset($themes[$theme_key]) && file_exists($themes[$theme_key]->info['screenshot'])) {
-        $theme->screenshot = array(
-          'uri' => $themes[$theme_key]->info['screenshot'],
-          'alt' => t('Screenshot for !theme theme', array('!theme' => $theme->info['name'])),
-          'title' => t('Screenshot for !theme theme', array('!theme' => $theme->info['name'])),
-          'attributes' => array('class' => array('screenshot')),
-        );
-        break;
-      }
-    }
-
-    if (empty($theme->status)) {
-     // Ensure this theme is compatible with this version of core.
-     // Require the 'content' region to make sure the main page
-     // content has a common place in all themes.
-      $theme->incompatible_core = !isset($theme->info['core']) || ($theme->info['core'] != Drupal::CORE_COMPATIBILITY) || (!isset($theme->info['regions']['content']));
-      $theme->incompatible_php = version_compare(phpversion(), $theme->info['php']) < 0;
-      // Confirmed that the base theme is available.
-      $theme->incompatible_base = (isset($theme->info['base theme']) && !isset($themes[$theme->info['base theme']]));
-      // Confirm that the theme engine is available.
-      $theme->incompatible_engine = (isset($theme->info['engine']) && !isset($theme->owner));
-    }
-    $query['token'] = drupal_get_token('system-theme-operation-link');
-    $theme->operations = array();
-    if (!empty($theme->status) || !$theme->incompatible_core && !$theme->incompatible_php && !$theme->incompatible_base && !$theme->incompatible_engine) {
-      // Create the operations links.
-      $query['theme'] = $theme->name;
-      if (drupal_theme_access($theme)) {
-        $theme->operations[] = array(
-          'title' => t('Settings'),
-          'href' => 'admin/appearance/settings/' . $theme->name,
-          'attributes' => array('title' => t('Settings for !theme theme', array('!theme' => $theme->info['name']))),
-        );
-      }
-      if (!empty($theme->status)) {
-        if (!$theme->is_default) {
-          if ($theme->name != $admin_theme) {
-            $theme->operations[] = array(
-              'title' => t('Disable'),
-              'href' => 'admin/appearance/disable',
-              'query' => $query,
-              'attributes' => array('title' => t('Disable !theme theme', array('!theme' => $theme->info['name']))),
-            );
-          }
-          $theme->operations[] = array(
-            'title' => t('Set default'),
-            'href' => 'admin/appearance/default',
-            'query' => $query,
-            'attributes' => array('title' => t('Set !theme as default theme', array('!theme' => $theme->info['name']))),
-          );
-        }
-        $admin_theme_options[$theme->name] = $theme->info['name'];
-      }
-      else {
-        $theme->operations[] = array(
-          'title' => t('Enable'),
-          'href' => 'admin/appearance/enable',
-          'query' => $query,
-          'attributes' => array('title' => t('Enable !theme theme', array('!theme' => $theme->info['name']))),
-        );
-        $theme->operations[] = array(
-          'title' => t('Enable and set default'),
-          'href' => 'admin/appearance/default',
-          'query' => $query,
-          'attributes' => array('title' => t('Enable !theme as default theme', array('!theme' => $theme->info['name']))),
-        );
-      }
-    }
-
-    // Add notes to default and administration theme.
-    $theme->notes = array();
-    $theme->classes = array();
-    if ($theme->is_default) {
-      $theme->classes[] = 'theme-default';
-      $theme->notes[] = t('default theme');
-    }
-    if ($theme->name == $admin_theme || ($theme->is_default && $admin_theme == '0')) {
-      $theme->classes[] = 'theme-admin';
-      $theme->notes[] = t('admin theme');
-    }
-
-    // Sort enabled and disabled themes into their own groups.
-    $theme_groups[$theme->status ? 'enabled' : 'disabled'][] = $theme;
-  }
-
-  // There are two possible theme groups.
-  $theme_group_titles = array(
-    'enabled' => format_plural(count($theme_groups['enabled']), 'Enabled theme', 'Enabled themes'),
-  );
-  if (!empty($theme_groups['disabled'])) {
-    $theme_group_titles['disabled'] = format_plural(count($theme_groups['disabled']), 'Disabled theme', 'Disabled themes');
-  }
-
-  uasort($theme_groups['enabled'], 'system_sort_themes');
-  drupal_alter('system_themes_page', $theme_groups);
-
-  $admin_form = drupal_get_form('system_themes_admin_form', $admin_theme_options);
-  return theme('system_themes_page', array('theme_groups' => $theme_groups, 'theme_group_titles' => $theme_group_titles)) . drupal_render($admin_form);
-}
-
-/**
- * Form to select the administration theme.
- *
- * @ingroup forms
- * @see system_themes_admin_form_submit()
- */
-function system_themes_admin_form($form, &$form_state, $theme_options) {
-  // Administration theme settings.
-  $form['admin_theme'] = array(
-    '#type' => 'details',
-    '#title' => t('Administration theme'),
-  );
-  $form['admin_theme']['admin_theme'] = array(
-    '#type' => 'select',
-    '#options' => array(0 => t('Default theme')) + $theme_options,
-    '#title' => t('Administration theme'),
-    '#description' => t('Choose "Default theme" to always use the same theme as the rest of the site.'),
-    '#default_value' => Drupal::config('system.theme')->get('admin'),
-  );
-  $form['admin_theme']['actions'] = array('#type' => 'actions');
-  $form['admin_theme']['actions']['submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Save configuration'),
-  );
-  return $form;
-}
-
-/**
- * Process system_themes_admin_form form submissions.
- */
-function system_themes_admin_form_submit($form, &$form_state) {
-  drupal_set_message(t('The configuration options have been saved.'));
-  Drupal::config('system.theme')->set('admin', $form_state['values']['admin_theme'])->save();
-}
-
-/**
  * Menu callback; Set the default theme.
  */
 function system_theme_default() {
@@ -254,26 +89,6 @@ function _system_is_incompatible(&$incompatible, $files, $file) {
 }
 
 /**
- * Array sorting callback; sorts modules or themes by their name.
- */
-function system_sort_modules_by_info_name($a, $b) {
-  return strcasecmp($a->info['name'], $b->info['name']);
-}
-
-/**
- * Array sorting callback; sorts modules or themes by their name.
- */
-function system_sort_themes($a, $b) {
-  if ($a->is_default) {
-    return -1;
-  }
-  if ($b->is_default) {
-    return 1;
-  }
-  return strcasecmp($a->info['name'], $b->info['name']);
-}
-
-/**
  * Default page callback for batches.
  */
 function system_batch_page() {
diff --git c/core/modules/system/system.module w/core/modules/system/system.module
index 10bc48d..aa15a20 100644
--- c/core/modules/system/system.module
+++ w/core/modules/system/system.module
@@ -139,7 +139,7 @@ function system_help($path, $arg) {
 function system_theme() {
   return array_merge(drupal_common_theme(), array(
     'system_themes_page' => array(
-      'variables' => array('theme_groups' => NULL),
+      'variables' => array('theme_groups' => NULL, 'theme_group_titles' => NULL),
       'file' => 'system.admin.inc',
     ),
     'system_config_form' => array(
@@ -648,11 +648,9 @@ function system_menu() {
   $items['admin/appearance'] = array(
     'title' => 'Appearance',
     'description' => 'Select and configure your themes.',
-    'page callback' => 'system_themes_page',
-    'access arguments' => array('administer themes'),
+    'route_name' => 'system_theme_listing',
     'position' => 'left',
     'weight' => -6,
-    'file' => 'system.admin.inc',
   );
   $items['admin/appearance/list'] = array(
     'title' => 'List',
@@ -2710,6 +2708,41 @@ function _system_info_add_path($info, $path) {
 }
 
 /**
+ * Form to select the administration theme.
+ *
+ * @ingroup forms
+ * @see system_themes_admin_form_submit()
+ */
+function system_themes_admin_form($form, &$form_state, $theme_options) {
+  // Administration theme settings.
+  $form['admin_theme'] = array(
+    '#type' => 'details',
+    '#title' => t('Administration theme'),
+  );
+  $form['admin_theme']['admin_theme'] = array(
+    '#type' => 'select',
+    '#options' => array(0 => t('Default theme')) + $theme_options,
+    '#title' => t('Administration theme'),
+    '#description' => t('Choose "Default theme" to always use the same theme as the rest of the site.'),
+    '#default_value' => Drupal::config('system.theme')->get('admin'),
+  );
+  $form['admin_theme']['actions'] = array('#type' => 'actions');
+  $form['admin_theme']['actions']['submit'] = array(
+    '#type' => 'submit',
+    '#value' => t('Save configuration'),
+  );
+  return $form;
+}
+
+/**
+ * Process system_themes_admin_form form submissions.
+ */
+function system_themes_admin_form_submit($form, &$form_state) {
+  drupal_set_message(t('The configuration options have been saved.'));
+  Drupal::config('system.theme')->set('admin', $form_state['values']['admin_theme'])->save();
+}
+
+/**
  * Returns an array of default theme features.
  */
 function _system_default_theme_features() {
@@ -2756,6 +2789,13 @@ function system_region_list($theme_key, $show = REGIONS_ALL) {
 }
 
 /**
+ * Array sorting callback; sorts modules by their name.
+ */
+function system_sort_modules_by_info_name($a, $b) {
+  return strcasecmp($a->info['name'], $b->info['name']);
+}
+
+/**
  * Implements hook_system_info_alter().
  */
 function system_system_info_alter(&$info, $file, $type) {
diff --git c/core/modules/system/system.routing.yml w/core/modules/system/system.routing.yml
index a3bf62b..1c6d408 100644
--- c/core/modules/system/system.routing.yml
+++ w/core/modules/system/system.routing.yml
@@ -237,6 +237,13 @@ system_modules_list_confirm:
   requirements:
     _permission: 'administer modules'
 
+system_theme_listing:
+  pattern: '/admin/appearance'
+  defaults:
+    _content: 'Drupal\system\Controller\ThemeListingController::listingPage'
+  requirements:
+    _permission: 'administer themes'
+
 system_theme_disable:
   pattern: '/admin/appearance/disable'
   defaults: