diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AutoDecorationServicePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AutoDecorationServicePass.php
new file mode 100644
index 0000000000000..05ae0d09cc15a
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AutoDecorationServicePass.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\DecorationPriorityAwareInterface;
+use Symfony\Component\DependencyInjection\DecoratorInterface;
+
+/**
+ * Adds decorated service to definition of services implementing DecoratorInterface.
+ *
+ * @author Grégory SURACI <gregory.suraci@free.fr>
+ */
+class AutoDecorationServicePass implements CompilerPassInterface
+{
+    private $throwOnException;
+
+    public function __construct(bool $throwOnException = true)
+    {
+        $this->throwOnException = $throwOnException;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        foreach ($container->getDefinitions() as $definition) {
+            $className = $definition->getClass();
+
+            if (null === $className) {
+                continue;
+            }
+
+            try {
+                $classInterfaces = class_implements($className);
+
+                if (!\in_array(DecoratorInterface::class, $classInterfaces)) {
+                    continue;
+                }
+
+                if (\in_array(DecorationPriorityAwareInterface::class, $classInterfaces)) {
+                    $definition->setDecoratedService(
+                        $className::getDecoratedServiceId(),
+                        null,
+                        $className::getDecorationPriority()
+                    );
+
+                    continue;
+                }
+
+                $definition->setDecoratedService($className::getDecoratedServiceId());
+            } catch (\Throwable $e) {
+                if ($this->throwOnException) {
+                    throw $e;
+                }
+
+                continue;
+            }
+        }
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php b/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
index 6cbc5544adbe8..36398d07cde4d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
@@ -61,6 +61,7 @@ public function __construct()
             new AutowireRequiredPropertiesPass(),
             new ResolveBindingsPass(),
             new ServiceLocatorTagPass(),
+            new AutoDecorationServicePass(false),
             new DecoratorServicePass(),
             new CheckDefinitionValidityPass(),
             new AutowirePass(false),
diff --git a/src/Symfony/Component/DependencyInjection/DecorationPriorityAwareInterface.php b/src/Symfony/Component/DependencyInjection/DecorationPriorityAwareInterface.php
new file mode 100644
index 0000000000000..67d7c688d8e3a
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/DecorationPriorityAwareInterface.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection;
+
+/**
+ * DecorationPriorityAwareInterface sets the decoration_priority value for a class implementing DecoratorInterface.
+ *
+ * @author Grégory SURACI <gregory.suraci@free.fr>
+ */
+interface DecorationPriorityAwareInterface
+{
+    /**
+     * @return int the decoration priority
+     */
+    public static function getDecorationPriority(): int;
+}
diff --git a/src/Symfony/Component/DependencyInjection/DecoratorInterface.php b/src/Symfony/Component/DependencyInjection/DecoratorInterface.php
new file mode 100644
index 0000000000000..8b8dade2d5f88
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/DecoratorInterface.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection;
+
+/**
+ * DecoratorInterface defines a decorator class without configuration.
+ *
+ * @author Grégory SURACI <gregory.suraci@free.fr>
+ */
+interface DecoratorInterface
+{
+    /**
+     * @return string the serviceId/FQCN that will be decorated by this interface's implementation
+     */
+    public static function getDecoratedServiceId(): string;
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutoDecorationServicePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutoDecorationServicePassTest.php
new file mode 100644
index 0000000000000..ed31a5c0adca3
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutoDecorationServicePassTest.php
@@ -0,0 +1,100 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Compiler\AutoDecorationServicePass;
+use Symfony\Component\DependencyInjection\Compiler\DecoratorServicePass;
+use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\Dummy;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\DummyDecorator1;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\DummyDecorator2;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\DummyDecorator3;
+
+class AutoDecorationServicePassTest extends TestCase
+{
+    public function testProcessUsingFQCN()
+    {
+        $container = new ContainerBuilder();
+        $dummyDefinition = $container
+            ->register(Dummy::class)
+            ->setPublic(true)
+        ;
+        $decoratorDefinition = $container
+            ->register('dummy.extended', DummyDecorator1::class)
+            ->setPublic(true)
+        ;
+
+        $this->process($container);
+
+        $this->assertSame($dummyDefinition, $container->getDefinition('dummy.extended.inner'));
+        $this->assertFalse($container->getDefinition('dummy.extended.inner')->isPublic());
+
+        $this->assertNull($decoratorDefinition->getDecoratedService());
+    }
+
+    public function testProcessUsingStringServiceId()
+    {
+        $container = new ContainerBuilder();
+        $dummyDefinition = $container
+            ->register('dummy', Dummy::class)
+            ->setPublic(true)
+        ;
+        $decoratorDefinition = $container
+            ->register('dummy.extended', DummyDecorator2::class)
+            ->setPublic(true)
+        ;
+
+        $this->process($container);
+
+        $this->assertSame($dummyDefinition, $container->getDefinition('dummy.extended.inner'));
+        $this->assertFalse($container->getDefinition('dummy.extended.inner')->isPublic());
+
+        $this->assertNull($decoratorDefinition->getDecoratedService());
+    }
+
+    public function testProcessWithDecorationPriority()
+    {
+        $container = new ContainerBuilder();
+        $dummyDefinition = $container
+            ->register(Dummy::class)
+            ->setPublic(true)
+        ;
+        $decoratorWithHighPriorityDefinition = $container
+            ->register('dummy.extended', DummyDecorator3::class)
+            ->setPublic(true)
+        ;
+        $decoratorDefinition = $container
+            ->register('dummy.extended.extended', DummyDecorator1::class)
+            ->setPublic(true)
+        ;
+
+        $this->process($container);
+
+        $this->assertSame($dummyDefinition, $container->getDefinition('dummy.extended.inner'));
+        $this->assertFalse($container->getDefinition('dummy.extended.inner')->isPublic());
+
+        $this->assertEquals('dummy.extended', $container->getAlias('dummy.extended.extended.inner'));
+        $this->assertFalse($container->getAlias('dummy.extended.extended.inner')->isPublic());
+
+        $this->assertNull($decoratorWithHighPriorityDefinition->getDecoratedService());
+        $this->assertNull($decoratorDefinition->getDecoratedService());
+    }
+
+    protected function process(ContainerBuilder $container)
+    {
+        (new ResolveClassPass())->process($container);
+        (new AutoDecorationServicePass())->process($container);
+        (new DecoratorServicePass())->process($container);
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Dummy.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Dummy.php
new file mode 100644
index 0000000000000..4d57f16303f2d
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Dummy.php
@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+class Dummy implements DummyInterface
+{
+    public function sayHello(): string
+    {
+        return 'Hello Dummy';
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator1.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator1.php
new file mode 100644
index 0000000000000..145ecee7c6bd6
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator1.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+use Symfony\Component\DependencyInjection\DecoratorInterface;
+
+class DummyDecorator1 implements DecoratorInterface, DummyInterface
+{
+    /**
+     * @var DummyInterface
+     */
+    protected $decorated;
+
+    public function __construct(DummyInterface $decorated)
+    {
+        $this->decorated = $decorated;
+    }
+
+    public static function getDecoratedServiceId(): string
+    {
+        return Dummy::class;
+    }
+
+    public function sayHello(): string
+    {
+        return sprintf('%s & Decorator1', $this->decorated->sayHello());
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator2.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator2.php
new file mode 100644
index 0000000000000..d416e0f91ed54
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator2.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+use Symfony\Component\DependencyInjection\DecoratorInterface;
+
+class DummyDecorator2 implements DecoratorInterface, DummyInterface
+{
+    /**
+     * @var DummyInterface
+     */
+    protected $decorated;
+
+    public function __construct(DummyInterface $decorated)
+    {
+        $this->decorated = $decorated;
+    }
+
+    public static function getDecoratedServiceId(): string
+    {
+        return 'dummy';
+    }
+
+    public function sayHello(): string
+    {
+        return sprintf('%s & Decorator2', $this->decorated->sayHello());
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator3.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator3.php
new file mode 100644
index 0000000000000..431b750be01f3
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyDecorator3.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+use Symfony\Component\DependencyInjection\DecorationPriorityAwareInterface;
+
+class DummyDecorator3 extends DummyDecorator1 implements DecorationPriorityAwareInterface, DummyInterface
+{
+    public static function getDecorationPriority(): int
+    {
+        return 42;
+    }
+
+    public function sayHello(): string
+    {
+        return sprintf('%s & Decorator3', $this->decorated->sayHello());
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyInterface.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyInterface.php
new file mode 100644
index 0000000000000..f3a4054c49aeb
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/DummyInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+interface DummyInterface
+{
+    public function sayHello(): string;
+}