diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index 52624c2cd173..b17af2960dda 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -13,6 +13,8 @@ CHANGELOG
  * Add `secrets:reveal` command
  * Add `rate_limiter` option to `http_client.default_options` and `http_client.scoped_clients`
  * Attach the workflow's configuration to the `workflow` tag
+ * Add support for executing custom workflow definition validators during the
+   container compilation
 
 7.0
 ---
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 1d15c93611f7..003c74172731 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -49,6 +49,7 @@
 use Symfony\Component\Validator\Validation;
 use Symfony\Component\Webhook\Controller\WebhookController;
 use Symfony\Component\WebLink\HttpHeaderSerializer;
+use Symfony\Component\Workflow\Validator\DefinitionValidatorInterface;
 use Symfony\Component\Workflow\WorkflowEvents;
 
 /**
@@ -381,6 +382,7 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode): void
                             ->useAttributeAsKey('name')
                             ->prototype('array')
                                 ->fixXmlConfig('support')
+                                ->fixXmlConfig('definition_validator')
                                 ->fixXmlConfig('place')
                                 ->fixXmlConfig('transition')
                                 ->fixXmlConfig('event_to_dispatch', 'events_to_dispatch')
@@ -418,6 +420,23 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode): void
                                             ->end()
                                         ->end()
                                     ->end()
+                                    ->arrayNode('definition_validators')
+                                        ->beforeNormalization()
+                                            ->ifString()
+                                            ->then(fn ($v) => [$v])
+                                        ->end()
+                                        ->prototype('scalar')
+                                            ->cannotBeEmpty()
+                                            ->validate()
+                                                ->ifTrue(fn ($v) => !class_exists($v) && !interface_exists($v, false))
+                                                ->thenInvalid('The validation class %s does not exist.')
+                                            ->end()
+                                            ->validate()
+                                                ->ifTrue(fn ($v) => !is_a($v, DefinitionValidatorInterface::class, true))
+                                                ->thenInvalid(sprintf('The validation class %%s is not an instance of %s.', DefinitionValidatorInterface::class))
+                                            ->end()
+                                        ->end()
+                                    ->end()
                                     ->scalarNode('support_strategy')
                                         ->cannotBeEmpty()
                                     ->end()
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 7a52d9f9bf8a..90c898291d1c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -1053,6 +1053,10 @@ private function registerWorkflowConfiguration(array $config, ContainerBuilder $
             $realDefinition = new Workflow\Definition($places, $trs, $initialMarking);
             $validator->validate($realDefinition, $name);
 
+            foreach ($workflow['definition_validators'] as $validatorClass) {
+                (new $validatorClass())->validate($realDefinition, $name);
+            }
+
             // Add workflow to Registry
             if ($workflow['supports']) {
                 foreach ($workflow['supports'] as $supportedClassName) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd b/src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd
index f1169e630caf..5fa8cc4abcb4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd
@@ -386,6 +386,7 @@
             <xsd:element name="initial-marking" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="marking-store" type="marking_store" minOccurs="0" maxOccurs="1" />
             <xsd:element name="support" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
+            <xsd:element name="definition-validator" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="event-to-dispatch" type="event_to_dispatch" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="place" type="place" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="transition" type="transition" minOccurs="0" maxOccurs="unbounded" />
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/Workflow/Validator/DefinitionValidator.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/Workflow/Validator/DefinitionValidator.php
new file mode 100644
index 000000000000..29fd60ef3e43
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/Workflow/Validator/DefinitionValidator.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Fixtures\Workflow\Validator;
+
+use Symfony\Component\Workflow\Definition;
+use Symfony\Component\Workflow\Validator\DefinitionValidatorInterface;
+
+class DefinitionValidator implements DefinitionValidatorInterface
+{
+    public static bool $called = false;
+
+    public function validate(Definition $definition, string $name): void
+    {
+        self::$called = true;
+    }
+}
+
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/workflows.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/workflows.php
index 118a627c7c05..2c29b848901e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/workflows.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/workflows.php
@@ -13,6 +13,9 @@
             'supports' => [
                 FrameworkExtensionTestCase::class,
             ],
+            'definition_validators' => [
+                Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Fixtures\Workflow\Validator\DefinitionValidator::class,
+            ],
             'initial_marking' => ['draft'],
             'metadata' => [
                 'title' => 'article workflow',
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/workflows.xml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/workflows.xml
index 76b4f07a87a4..c5dae479d3d6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/workflows.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/workflows.xml
@@ -13,6 +13,7 @@
             <framework:audit-trail enabled="true"/>
             <framework:initial-marking>draft</framework:initial-marking>
             <framework:support>Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\FrameworkExtensionTestCase</framework:support>
+            <framework:definition-validator>Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Fixtures\Workflow\Validator\DefinitionValidator</framework:definition-validator>
             <framework:place name="draft" />
             <framework:place name="wait_for_journalist" />
             <framework:place name="approved_by_journalist" />
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/workflows.yml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/workflows.yml
index a9b427d89408..cac5f6f230f9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/workflows.yml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/workflows.yml
@@ -9,6 +9,8 @@ framework:
             type: workflow
             supports:
                 - Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\FrameworkExtensionTestCase
+            definition_validators:
+                - Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Fixtures\Workflow\Validator\DefinitionValidator
             initial_marking: [draft]
             metadata:
                 title: article workflow
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTestCase.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTestCase.php
index c73197607900..216f0131e37f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTestCase.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTestCase.php
@@ -15,6 +15,7 @@
 use Psr\Log\LoggerAwareInterface;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\FrameworkExtension;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Fixtures\Workflow\Validator\DefinitionValidator;
 use Symfony\Bundle\FrameworkBundle\Tests\Fixtures\Messenger\DummyMessage;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FullStack;
@@ -289,6 +290,8 @@ public function testProfilerCollectSerializerDataDefaultDisabled()
 
     public function testWorkflows()
     {
+        DefinitionValidator::$called = false;
+
         $container = $this->createContainerFromFile('workflows');
 
         $this->assertTrue($container->hasDefinition('workflow.article'), 'Workflow is registered as a service');
@@ -312,6 +315,7 @@ public function testWorkflows()
         ], $tags['workflow'][0]['metadata'] ?? null);
 
         $this->assertTrue($container->hasDefinition('workflow.article.definition'), 'Workflow definition is registered as a service');
+        $this->assertTrue(DefinitionValidator::$called, 'DefinitionValidator is called');
 
         $workflowDefinition = $container->getDefinition('workflow.article.definition');