diff --git a/config/v9/typo3-93.php b/config/v9/typo3-93.php
index 18f85f4e0..20d0c864f 100644
--- a/config/v9/typo3-93.php
+++ b/config/v9/typo3-93.php
@@ -8,6 +8,7 @@
 use Ssch\TYPO3Rector\Rector\v9\v3\BackendUserAuthenticationSimplelogRector;
 use Ssch\TYPO3Rector\Rector\v9\v3\BackendUtilityGetModuleUrlRector;
 use Ssch\TYPO3Rector\Rector\v9\v3\CopyMethodGetPidForModTSconfigRector;
+use Ssch\TYPO3Rector\Rector\v9\v3\MoveLanguageFilesFromExtensionLangRector;
 use Ssch\TYPO3Rector\Rector\v9\v3\PropertyUserTsToMethodGetTsConfigOfBackendUserAuthenticationRector;
 use Ssch\TYPO3Rector\Rector\v9\v3\RemoveColPosParameterRector;
 use Ssch\TYPO3Rector\Rector\v9\v3\UseMethodGetPageShortcutDirectlyFromSysPageRector;
@@ -40,4 +41,5 @@
     $services->set(UseMethodGetPageShortcutDirectlyFromSysPageRector::class);
     $services->set(CopyMethodGetPidForModTSconfigRector::class);
     $services->set(BackendUserAuthenticationSimplelogRector::class);
+    $services->set(MoveLanguageFilesFromExtensionLangRector::class);
 };
diff --git a/src/Rector/v9/v3/MoveLanguageFilesFromExtensionLangRector.php b/src/Rector/v9/v3/MoveLanguageFilesFromExtensionLangRector.php
new file mode 100644
index 000000000..82f891079
--- /dev/null
+++ b/src/Rector/v9/v3/MoveLanguageFilesFromExtensionLangRector.php
@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ssch\TYPO3Rector\Rector\v9\v3;
+
+use Nette\Utils\Strings;
+use PhpParser\Node;
+use PhpParser\Node\Scalar\String_;
+use Rector\Core\Rector\AbstractRector;
+use Rector\Core\RectorDefinition\CodeSample;
+use Rector\Core\RectorDefinition\RectorDefinition;
+
+/**
+ * @see https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/9.3/Deprecation-84680-MoveLastLanguageFilesAwayFromExtlangAndRemoveExtlangCompletely.html
+ */
+final class MoveLanguageFilesFromExtensionLangRector extends AbstractRector
+{
+    /**
+     * @var string[]
+     */
+    private const MAPPING_OLD_TO_NEW_PATHS = [
+        'lang/Resources/Private/Language/locallang_alt_intro.xlf' => 'about/Resources/Private/Language/Modules/locallang_alt_intro.xlf',
+        'lang/Resources/Private/Language/locallang_alt_doc.xlf' => 'backend/Resources/Private/Language/locallang_alt_doc.xlf',
+        'lang/Resources/Private/Language/locallang_login.xlf' => 'backend/Resources/Private/Language/locallang_login.xlf',
+        'lang/Resources/Private/Language/locallang_common.xlf' => 'core/Resources/Private/Language/locallang_common.xlf',
+        'lang/Resources/Private/Language/locallang_core.xlf' => 'core/Resources/Private/Language/locallang_core.xlf',
+        'lang/Resources/Private/Language/locallang_general.xlf' => 'core/Resources/Private/Language/locallang_general.xlf',
+        'lang/Resources/Private/Language/locallang_misc.xlf' => 'core/Resources/Private/Language/locallang_misc.xlf',
+        'lang/Resources/Private/Language/locallang_mod_web_list.xlf' => 'core/Resources/Private/Language/locallang_mod_web_list.xlf',
+        'lang/Resources/Private/Language/locallang_tca.xlf' => 'core/Resources/Private/Language/locallang_tca.xlf',
+        'lang/Resources/Private/Language/locallang_tsfe.xlf' => 'core/Resources/Private/Language/locallang_tsfe.xlf',
+        'lang/Resources/Private/Language/locallang_wizards.xlf' => 'core/Resources/Private/Language/locallang_wizards.xlf',
+        'lang/Resources/Private/Language/locallang_browse_links.xlf' => 'recordlist/Resources/Private/Language/locallang_browse_links.xlf',
+        'lang/Resources/Private/Language/locallang_tcemain.xlf' => 'workspaces/Resources/Private/Language/locallang_tcemain.xlf',
+    ];
+
+    public function getNodeTypes(): array
+    {
+        return [String_::class];
+    }
+
+    /**
+     * @param String_ $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        $value = $this->getValue($node);
+
+        foreach (self::MAPPING_OLD_TO_NEW_PATHS as $oldPath => $newPath) {
+            if (Strings::contains($value, $oldPath)) {
+                return new String_(str_replace($oldPath, $newPath, $value));
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('', [
+            new CodeSample(<<<'PHP'
+use TYPO3\CMS\Core\Localization\LanguageService;
+$languageService = new LanguageService();
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.no_title');
+PHP
+                , <<<'PHP'
+use TYPO3\CMS\Core\Localization\LanguageService;
+$languageService = new LanguageService();
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:labels.no_title');
+PHP
+            ),
+        ]);
+    }
+}
diff --git a/stubs/Core/Localization/LanguageService.php b/stubs/Core/Localization/LanguageService.php
index f295108aa..4f892f725 100644
--- a/stubs/Core/Localization/LanguageService.php
+++ b/stubs/Core/Localization/LanguageService.php
@@ -11,6 +11,9 @@ final class LanguageService
 {
     public function init(string $language): void
     {
+    }
 
+    public function sL($label): void
+    {
     }
 }
diff --git a/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/Fixture/move_language_files.php.inc b/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/Fixture/move_language_files.php.inc
new file mode 100644
index 000000000..da179a3bb
--- /dev/null
+++ b/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/Fixture/move_language_files.php.inc
@@ -0,0 +1,207 @@
+<?php
+
+namespace Ssch\TYPO3Rector\Tests\Rector\v9\v3\MoveLanguageFilesFromExtensionLang\Fixture;
+use TYPO3\CMS\Core\Localization\LanguageService;
+
+/** Keep it in the comments LLL:EXT:lang/Resources/Private/Language/locallang_alt_intro.xlf */
+
+class MySpecialClass
+{
+    protected $itemsConfiguration = [
+        'edit' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.edit',
+            'iconIdentifier' => 'actions-page-open',
+            'callbackAction' => 'editFile'
+        ],
+        'rename' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.rename',
+            'iconIdentifier' => 'actions-edit-rename',
+            'callbackAction' => 'renameFile'
+        ],
+        'upload' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.upload',
+            'iconIdentifier' => 'actions-edit-upload',
+            'callbackAction' => 'uploadFile'
+        ],
+        'new' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.new',
+            'iconIdentifier' => 'actions-document-new',
+            'callbackAction' => 'createFile'
+        ],
+        'info' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.info',
+            'iconIdentifier' => 'actions-document-info',
+            'callbackAction' => 'openInfoPopUp'
+        ],
+        'divider' => [
+            'type' => 'divider'
+        ],
+        'copy' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.copy',
+            'iconIdentifier' => 'actions-edit-copy',
+            'callbackAction' => 'copyFile'
+        ],
+        'copyRelease' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.copy',
+            'iconIdentifier' => 'actions-edit-copy-release',
+            'callbackAction' => 'copyReleaseFile'
+        ],
+        'cut' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.cut',
+            'iconIdentifier' => 'actions-edit-cut',
+            'callbackAction' => 'cutFile'
+        ],
+        'cutRelease' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.cutrelease',
+            'iconIdentifier' => 'actions-edit-cut-release',
+            'callbackAction' => 'cutReleaseFile'
+        ],
+        'pasteInto' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.pasteinto',
+            'iconIdentifier' => 'actions-document-paste-into',
+            'callbackAction' => 'pasteFileInto'
+        ],
+        'divider2' => [
+            'type' => 'divider'
+        ],
+        'delete' => [
+            'label' => 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:cm.delete',
+            'iconIdentifier' => 'actions-edit-delete',
+            'callbackAction' => 'deleteFile'
+        ],
+    ];
+
+    /**
+     * @var string
+     */
+    private $labels = 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:';
+
+    protected function getLabel($key)
+    {
+        return sprintf($this->labels . $key);
+    }
+}
+
+$languageService = new LanguageService();
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_alt_intro.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_alt_doc.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_login.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_common.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_general.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_misc.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_mod_web_list.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_tca.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_tsfe.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_wizards.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_browse_links.xlf');
+$languageService->sL('LLL:EXT:lang/Resources/Private/Language/locallang_tcemain.xlf');
+
+$coreLabels = 'LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:';
+$languageService->sL($coreLabels.'labels.reload');
+
+?>
+-----
+<?php
+
+namespace Ssch\TYPO3Rector\Tests\Rector\v9\v3\MoveLanguageFilesFromExtensionLang\Fixture;
+use TYPO3\CMS\Core\Localization\LanguageService;
+
+/** Keep it in the comments LLL:EXT:lang/Resources/Private/Language/locallang_alt_intro.xlf */
+
+class MySpecialClass
+{
+    protected $itemsConfiguration = [
+        'edit' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.edit',
+            'iconIdentifier' => 'actions-page-open',
+            'callbackAction' => 'editFile'
+        ],
+        'rename' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.rename',
+            'iconIdentifier' => 'actions-edit-rename',
+            'callbackAction' => 'renameFile'
+        ],
+        'upload' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.upload',
+            'iconIdentifier' => 'actions-edit-upload',
+            'callbackAction' => 'uploadFile'
+        ],
+        'new' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.new',
+            'iconIdentifier' => 'actions-document-new',
+            'callbackAction' => 'createFile'
+        ],
+        'info' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.info',
+            'iconIdentifier' => 'actions-document-info',
+            'callbackAction' => 'openInfoPopUp'
+        ],
+        'divider' => [
+            'type' => 'divider'
+        ],
+        'copy' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.copy',
+            'iconIdentifier' => 'actions-edit-copy',
+            'callbackAction' => 'copyFile'
+        ],
+        'copyRelease' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.copy',
+            'iconIdentifier' => 'actions-edit-copy-release',
+            'callbackAction' => 'copyReleaseFile'
+        ],
+        'cut' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.cut',
+            'iconIdentifier' => 'actions-edit-cut',
+            'callbackAction' => 'cutFile'
+        ],
+        'cutRelease' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.cutrelease',
+            'iconIdentifier' => 'actions-edit-cut-release',
+            'callbackAction' => 'cutReleaseFile'
+        ],
+        'pasteInto' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.pasteinto',
+            'iconIdentifier' => 'actions-document-paste-into',
+            'callbackAction' => 'pasteFileInto'
+        ],
+        'divider2' => [
+            'type' => 'divider'
+        ],
+        'delete' => [
+            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.delete',
+            'iconIdentifier' => 'actions-edit-delete',
+            'callbackAction' => 'deleteFile'
+        ],
+    ];
+
+    /**
+     * @var string
+     */
+    private $labels = 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:';
+
+    protected function getLabel($key)
+    {
+        return sprintf($this->labels . $key);
+    }
+}
+
+$languageService = new LanguageService();
+$languageService->sL('LLL:EXT:about/Resources/Private/Language/Modules/locallang_alt_intro.xlf');
+$languageService->sL('LLL:EXT:backend/Resources/Private/Language/locallang_alt_doc.xlf');
+$languageService->sL('LLL:EXT:backend/Resources/Private/Language/locallang_login.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_common.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_general.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_misc.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_mod_web_list.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_tca.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_tsfe.xlf');
+$languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_wizards.xlf');
+$languageService->sL('LLL:EXT:recordlist/Resources/Private/Language/locallang_browse_links.xlf');
+$languageService->sL('LLL:EXT:workspaces/Resources/Private/Language/locallang_tcemain.xlf');
+
+$coreLabels = 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:';
+$languageService->sL($coreLabels.'labels.reload');
+
+?>
diff --git a/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/MoveLanguageFilesFromExtensionLangRectorTest.php b/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/MoveLanguageFilesFromExtensionLangRectorTest.php
new file mode 100644
index 000000000..8c4c2fe3b
--- /dev/null
+++ b/tests/Rector/v9/v3/MoveLanguageFilesFromExtensionLang/MoveLanguageFilesFromExtensionLangRectorTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ssch\TYPO3Rector\Tests\Rector\v9\v3\MoveLanguageFilesFromExtensionLang;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+use Ssch\TYPO3Rector\Rector\v9\v3\MoveLanguageFilesFromExtensionLangRector;
+use Symplify\SmartFileSystem\SmartFileInfo;
+
+final class MoveLanguageFilesFromExtensionLangRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideDataForTest()
+     */
+    public function test(SmartFileInfo $file): void
+    {
+        $this->doTestFileInfo($file);
+    }
+
+    public function provideDataForTest(): Iterator
+    {
+        return $this->yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    protected function getRectorClass(): string
+    {
+        return MoveLanguageFilesFromExtensionLangRector::class;
+    }
+}