diff --git a/src/Symfony/Component/Form/Extension/Core/Type/EnumType.php b/src/Symfony/Component/Form/Extension/Core/Type/EnumType.php
index b529a5869cec5..106cb341d7003 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/EnumType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/EnumType.php
@@ -31,11 +31,15 @@ public function configureOptions(OptionsResolver $resolver): void
             ->setAllowedValues('class', enum_exists(...))
             ->setDefault('choices', static fn (Options $options): array => $options['class']::cases())
             ->setDefault('choice_label', static function (Options $options) {
-                if (\is_array($options['choices']) && !array_is_list($options['choices'])) {
-                    return null;
-                }
+                return static function (\UnitEnum $choice, int|string $key): string|TranslatableInterface {
+                    if (\is_int($key)) {
+                        // Key is an integer, use the enum's name (or translatable)
+                        return $choice instanceof TranslatableInterface ? $choice : $choice->name;
+                    }
 
-                return static fn (\UnitEnum $choice) => $choice instanceof TranslatableInterface ? $choice : $choice->name;
+                    // Key is a string, use it as the label
+                    return $key;
+                };
             })
             ->setDefault('choice_value', static function (Options $options): ?\Closure {
                 if (!is_a($options['class'], \BackedEnum::class, true)) {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/EnumTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/EnumTypeTest.php
index 3916d86ebca22..dfd162070d280 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/EnumTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/EnumTypeTest.php
@@ -11,6 +11,8 @@
 
 namespace Extension\Core\Type;
 
+use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
+use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\Extension\Core\Type\EnumType;
 use Symfony\Component\Form\Tests\Extension\Core\Type\BaseTypeTestCase;
 use Symfony\Component\Form\Tests\Fixtures\Answer;
@@ -311,6 +313,115 @@ public function testChoicesWithLabels()
         $this->assertSame('no', $view->children[1]->vars['label']);
     }
 
+    public function testGroupedEnumChoices()
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'multiple' => false,
+            'expanded' => true,
+            'class' => Answer::class,
+            'choices' => [
+                'Group 1' => [Answer::Yes, Answer::No],
+                'Group 2' => [Answer::FourtyTwo],
+            ],
+        ]);
+        $view = $form->createView();
+        $this->assertCount(2, $view->vars['choices']['Group 1']->choices);
+        $this->assertSame('Yes', $view->vars['choices']['Group 1']->choices[0]->label);
+        $this->assertSame('No', $view->vars['choices']['Group 1']->choices[1]->label);
+        $this->assertCount(1, $view->vars['choices']['Group 2']->choices);
+        $this->assertSame('FourtyTwo', $view->vars['choices']['Group 2']->choices[2]->label);
+    }
+
+    public function testGroupedEnumChoicesWithCustomLabels()
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'multiple' => false,
+            'expanded' => true,
+            'class' => Answer::class,
+            'choices' => [
+                'Group 1' => [
+                    'Custom Yes' => Answer::Yes,
+                    'Custom No' => Answer::No,
+                ],
+                'Group 2' => [
+                    'Custom 42' => Answer::FourtyTwo,
+                ],
+            ],
+        ]);
+        $view = $form->createView();
+
+        // Test Group 1
+        $this->assertCount(2, $view->vars['choices']['Group 1']->choices);
+        $this->assertSame('Custom Yes', $view->vars['choices']['Group 1']->choices[0]->label);
+        $this->assertSame('Custom No', $view->vars['choices']['Group 1']->choices[1]->label);
+
+        // Test Group 2
+        $this->assertCount(1, $view->vars['choices']['Group 2']->choices);
+        $this->assertSame('Custom 42', $view->vars['choices']['Group 2']->choices[2]->label);
+    }
+
+    public function testMixedGroupedAndSingleChoices()
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'multiple' => false,
+            'expanded' => true,
+            'class' => Answer::class,
+            'choices' => [
+                'Group 1' => [Answer::Yes, Answer::No],
+                'Custom 42' => Answer::FourtyTwo,
+            ],
+        ]);
+        $view = $form->createView();
+
+        // Group 1 (simple list) → enum names
+        $this->assertInstanceOf(ChoiceGroupView::class, $view->vars['choices']['Group 1']);
+        $this->assertCount(2, $view->vars['choices']['Group 1']->choices);
+        $this->assertSame('Yes', $view->vars['choices']['Group 1']->choices[0]->label);
+        $this->assertSame('No', $view->vars['choices']['Group 1']->choices[1]->label);
+
+        // Single custom → custom label (treated as flat choice)
+        $customChoice = $view->vars['choices'][2];
+        $this->assertInstanceOf(ChoiceView::class, $customChoice);
+        $this->assertSame('Custom 42', $customChoice->label);
+    }
+
+    public function testMixedLabeledAndUnlabeledChoices()
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'multiple' => false,
+            'expanded' => true,
+            'class' => Answer::class,
+            'choices' => [
+                Answer::Yes,
+                Answer::No,
+                'Custom 42' => Answer::FourtyTwo,
+            ],
+        ]);
+        $view = $form->createView();
+        // Assertions: names for unlabeled, custom for labeled
+        $children = array_values($view->children); // Numeric access
+        $this->assertSame('Yes', $children[0]->vars['label']);
+        $this->assertSame('No', $children[1]->vars['label']);
+        $this->assertSame('Custom 42', $children[2]->vars['label']);
+    }
+
+    public function testEnumChoicesWithNumericCustomLabels()
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'multiple' => false,
+            'expanded' => true,
+            'class' => Answer::class,
+            'choice_label' => null, // Explicitly override to use keys as labels for numeric customs
+            'choices' => [
+                '34' => Answer::Yes,
+                '2' => Answer::No,
+            ],
+        ]);
+        $view = $form->createView();
+        $this->assertSame('34', $view->children[0]->vars['label']);
+        $this->assertSame('2', $view->children[1]->vars['label']);
+    }
+
     protected function getTestOptions(): array
     {
         return ['class' => Suit::class];