diff --git a/README.md b/README.md
index 8b0081f..0c518e4 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,9 @@ You can also provide an associate array, if you want to map POEditor locales to
 
 // ... Or provide associative array with POEditor locales mapped to internal locales
 'locales' => ['en-gb' => 'en', 'nl-be' => 'nl'],
+
+// ... Or you can map multiple internal locales to the same POEditor locale
+'locales' => ['nl' => ['nl_BE', 'nl_NL']],
 ```
 
 ## Usage
diff --git a/src/Commands/DownloadCommand.php b/src/Commands/DownloadCommand.php
index eb27802..d74c657 100644
--- a/src/Commands/DownloadCommand.php
+++ b/src/Commands/DownloadCommand.php
@@ -32,7 +32,9 @@ public function handle()
         $this->getLocales()->each(function ($locale, $key) {
             $translations = app(Poeditor::class)->download(is_string($key) ? $key : $locale);
 
-            app(TranslationManager::class)->createTranslationFiles($translations, $locale);
+            collect($locale)->each(function ($internalLocale) use ($translations) {
+                app(TranslationManager::class)->createTranslationFiles($translations, $internalLocale);
+            });
         });
 
         $this->info('All translations have been downloaded!');
diff --git a/src/Commands/UploadCommand.php b/src/Commands/UploadCommand.php
index ede74ff..f0fbc33 100644
--- a/src/Commands/UploadCommand.php
+++ b/src/Commands/UploadCommand.php
@@ -63,7 +63,7 @@ protected function getLocale()
     {
         $locale = $this->argument('locale') ?? app()->getLocale();
 
-        if (! in_array($locale, config('poeditor-sync.locales'))) {
+        if (! collect(config('poeditor-sync.locales'))->flatten()->contains($locale)) {
             return;
         }
 
@@ -80,7 +80,9 @@ protected function getPoeditorLocale()
         $locales = config('poeditor-sync.locales');
 
         if (Arr::isAssoc($locales)) {
-            return array_flip($locales)[$this->getLocale()];
+            return collect($locales)->filter(function ($internalLocales) {
+                return collect($internalLocales)->contains($this->getLocale());
+            })->keys()->first();
         }
 
         return $this->getLocale();
diff --git a/tests/DownloadCommandTest.php b/tests/DownloadCommandTest.php
index 2fa9917..9665629 100644
--- a/tests/DownloadCommandTest.php
+++ b/tests/DownloadCommandTest.php
@@ -334,6 +334,35 @@ public function it_maps_poeditor_locales_on_internal_locales()
         $this->assertJsonTranslationFile($this->getLangPath('nl.json'), ['bar foo' => 'foo bar']);
     }
 
+    /** @test */
+    public function it_maps_poeditor_locales_on_multiple_internal_locales()
+    {
+        config()->set('poeditor-sync.locales', ['en' => 'en_GB', 'nl' => ['nl_BE', 'nl_NL']]);
+
+        $this->mockPoeditorDownload('en', [
+            'en-php-file' => [
+                'foo' => 'bar',
+            ],
+            'foo bar' => 'bar foo',
+        ]);
+
+        $this->mockPoeditorDownload('nl', [
+            'nl-php-file' => [
+                'bar' => 'foo',
+            ],
+            'bar foo' => 'foo bar',
+        ]);
+
+        $this->artisan('poeditor:download')->assertExitCode(0);
+
+        $this->assertPhpTranslationFile($this->getLangPath('en_GB/en-php-file.php'), ['foo' => 'bar']);
+        $this->assertJsonTranslationFile($this->getLangPath('en_GB.json'), ['foo bar' => 'bar foo']);
+        $this->assertPhpTranslationFile($this->getLangPath('nl_BE/nl-php-file.php'), ['bar' => 'foo']);
+        $this->assertJsonTranslationFile($this->getLangPath('nl_BE.json'), ['bar foo' => 'foo bar']);
+        $this->assertPhpTranslationFile($this->getLangPath('nl_NL/nl-php-file.php'), ['bar' => 'foo']);
+        $this->assertJsonTranslationFile($this->getLangPath('nl_NL.json'), ['bar foo' => 'foo bar']);
+    }
+
     /**
      * Mock the POEditor "download" method.
      *
diff --git a/tests/UploadCommandTest.php b/tests/UploadCommandTest.php
index 7b44792..4c8c070 100644
--- a/tests/UploadCommandTest.php
+++ b/tests/UploadCommandTest.php
@@ -236,6 +236,36 @@ public function it_maps_internal_locale_on_poeditor_locale()
         $this->artisan('poeditor:upload en')->assertExitCode(0);
     }
 
+    /** @test */
+    public function it_maps_one_of_multiple_internal_locale_on_the_poeditor_locale()
+    {
+        config()->set('poeditor-sync.locales', ['nl' => ['nl_BE', 'nl_NL']]);
+
+        $this->createPhpTranslationFile($this->getLangPath('nl_NL/nl-php-file.php'), ['bar' => 'foo NL']);
+        $this->createJsonTranslationFile($this->getLangPath('nl_NL.json'), ['foo_bar' => 'bar foo NL']);
+
+        $this->createPhpTranslationFile($this->getLangPath('nl_BE/nl-php-file.php'), ['bar' => 'foo BE']);
+        $this->createJsonTranslationFile($this->getLangPath('nl_BE.json'), ['foo_bar' => 'bar foo BE']);
+
+        $this->mockPoeditorUpload('nl', [
+            'nl-php-file' => [
+                'bar' => 'foo NL',
+            ],
+            'foo_bar' => 'bar foo NL',
+        ]);
+
+        $this->artisan('poeditor:upload nl_NL')->assertExitCode(0);
+
+        $this->mockPoeditorUpload('nl', [
+            'nl-php-file' => [
+                'bar' => 'foo BE',
+            ],
+            'foo_bar' => 'bar foo BE',
+        ]);
+
+        $this->artisan('poeditor:upload nl_BE')->assertExitCode(0);
+    }
+
     /** @test */
     public function it_throws_error_if_provided_locale_is_not_present_in_config_locales_array()
     {