diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
index 398d0c7d15..8caeaacbb8 100644
--- a/CHANGELOG-2.1.md
+++ b/CHANGELOG-2.1.md
@@ -305,6 +305,7 @@ To get the diff between two versions, go to https://github.com/symfony/symfony/c
  * made ExecutionContext immutable
  * deprecated Constraint methods `setMessage`, `getMessageTemplate` and
    `getMessageParameters`
+ * added support for dynamic group sequences with the GroupSequenceProvider pattern
 
 ### Yaml
 
diff --git a/src/Symfony/Component/Validator/Constraints/GroupSequenceProvider.php b/src/Symfony/Component/Validator/Constraints/GroupSequenceProvider.php
new file mode 100644
index 0000000000..457155981a
--- /dev/null
+++ b/src/Symfony/Component/Validator/Constraints/GroupSequenceProvider.php
@@ -0,0 +1,22 @@
+<?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\Validator\Constraints;
+
+/**
+ * Annotation to define a group sequence provider
+ *
+ * @Annotation
+ */
+class GroupSequenceProvider
+{
+
+}
diff --git a/src/Symfony/Component/Validator/GraphWalker.php b/src/Symfony/Component/Validator/GraphWalker.php
index dbdcfdb70e..0f4b99e634 100644
--- a/src/Symfony/Component/Validator/GraphWalker.php
+++ b/src/Symfony/Component/Validator/GraphWalker.php
@@ -17,6 +17,7 @@ use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Mapping\ClassMetadataFactoryInterface;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Mapping\MemberMetadata;
+use Symfony\Component\Validator\GroupSequenceProviderInterface;
 
 /**
  * Responsible for walking over and initializing validation on different
@@ -67,8 +68,13 @@ class GraphWalker
             $initializer->initialize($object);
         }
 
-        if ($group === Constraint::DEFAULT_GROUP && $metadata->hasGroupSequence()) {
-            $groups = $metadata->getGroupSequence();
+        if ($group === Constraint::DEFAULT_GROUP && ($metadata->hasGroupSequence() || $metadata->isGroupSequenceProvider())) {
+            if ($metadata->hasGroupSequence()) {
+                $groups = $metadata->getGroupSequence();
+            } else {
+                $groups = $object->getGroupSequence();
+            }
+
             foreach ($groups as $group) {
                 $this->walkObjectForGroup($metadata, $object, $group, $propertyPath, Constraint::DEFAULT_GROUP);
 
diff --git a/src/Symfony/Component/Validator/GroupSequenceProviderInterface.php b/src/Symfony/Component/Validator/GroupSequenceProviderInterface.php
new file mode 100644
index 0000000000..676a3b399f
--- /dev/null
+++ b/src/Symfony/Component/Validator/GroupSequenceProviderInterface.php
@@ -0,0 +1,26 @@
+<?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\Validator;
+
+/**
+ * Defines the interface for a group sequence provider.
+ */
+interface GroupSequenceProviderInterface
+{
+    /**
+     * Returns which validation groups should be used for a certain state
+     * of the object.
+     *
+     * @return array An array of validation groups
+     */
+    function getGroupSequence();
+}
diff --git a/src/Symfony/Component/Validator/Mapping/ClassMetadata.php b/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
index 237d854cbb..2d8c60f098 100644
--- a/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
@@ -29,6 +29,7 @@ class ClassMetadata extends ElementMetadata
     public $properties = array();
     public $getters = array();
     public $groupSequence = array();
+    public $groupSequenceProvider = false;
     private $reflClass;
 
     /**
@@ -57,6 +58,7 @@ class ClassMetadata extends ElementMetadata
         return array_merge(parent::__sleep(), array(
             'getters',
             'groupSequence',
+            'groupSequenceProvider',
             'members',
             'name',
             'properties',
@@ -247,6 +249,10 @@ class ClassMetadata extends ElementMetadata
      */
     public function setGroupSequence(array $groups)
     {
+        if ($this->isGroupSequenceProvider()) {
+            throw new GroupDefinitionException('Defining a static group sequence is not allowed with a group sequence provider');
+        }
+
         if (in_array(Constraint::DEFAULT_GROUP, $groups, true)) {
             throw new GroupDefinitionException(sprintf('The group "%s" is not allowed in group sequences', Constraint::DEFAULT_GROUP));
         }
@@ -293,4 +299,32 @@ class ClassMetadata extends ElementMetadata
 
         return $this->reflClass;
     }
+
+    /**
+     * Sets whether a group sequence provider should be used
+     *
+     * @param boolean $active
+     */
+    public function setGroupSequenceProvider($active)
+    {
+        if ($this->hasGroupSequence()) {
+            throw new GroupDefinitionException('Defining a group sequence provider is not allowed with a static group sequence');
+        }
+
+        if (!$this->getReflectionClass()->implementsInterface('Symfony\Component\Validator\GroupSequenceProviderInterface')) {
+            throw new GroupDefinitionException(sprintf('Class "%s" must implement GroupSequenceProviderInterface', $this->name));
+        }
+
+        $this->groupSequenceProvider = $active;
+    }
+
+    /**
+     * Returns whether the class is a group sequence provider.
+     *
+     * @return boolean
+     */
+    public function isGroupSequenceProvider()
+    {
+        return $this->groupSequenceProvider;
+    }
 }
diff --git a/src/Symfony/Component/Validator/Mapping/ClassMetadataFactory.php b/src/Symfony/Component/Validator/Mapping/ClassMetadataFactory.php
index a16dfdc3b6..691f830c88 100644
--- a/src/Symfony/Component/Validator/Mapping/ClassMetadataFactory.php
+++ b/src/Symfony/Component/Validator/Mapping/ClassMetadataFactory.php
@@ -58,6 +58,9 @@ class ClassMetadataFactory implements ClassMetadataFactoryInterface
 
                 // Include constraints from all implemented interfaces
                 foreach ($metadata->getReflectionClass()->getInterfaces() as $interface) {
+                    if ('Symfony\Component\Validator\GroupSequenceProviderInterface' === $interface->getName()) {
+                        continue;
+                    }
                     $metadata->mergeConstraints($this->getClassMetadata($interface->getName()));
                 }
 
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php
index 2474dba79f..30642a0474 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php
@@ -15,6 +15,7 @@ use Doctrine\Common\Annotations\Reader;
 use Symfony\Component\Validator\Exception\MappingException;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Constraints\GroupSequence;
+use Symfony\Component\Validator\Constraints\GroupSequenceProvider;
 use Symfony\Component\Validator\Constraint;
 
 class AnnotationLoader implements LoaderInterface
@@ -38,6 +39,8 @@ class AnnotationLoader implements LoaderInterface
         foreach ($this->reader->getClassAnnotations($reflClass) as $constraint) {
             if ($constraint instanceof GroupSequence) {
                 $metadata->setGroupSequence($constraint->groups);
+            } elseif ($constraint instanceof GroupSequenceProvider) {
+                $metadata->setGroupSequenceProvider(true);
             } elseif ($constraint instanceof Constraint) {
                 $metadata->addConstraint($constraint);
             }
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
index ef130d4b42..4c185c604d 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
@@ -43,6 +43,10 @@ class XmlFileLoader extends FileLoader
         if (isset($this->classes[$metadata->getClassName()])) {
             $xml = $this->classes[$metadata->getClassName()];
 
+            foreach ($xml->{'group-sequence-provider'} as $provider) {
+                $metadata->setGroupSequenceProvider(true);
+            }
+
             foreach ($this->parseConstraints($xml->constraint) as $constraint) {
                 $metadata->addConstraint($constraint);
             }
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
index c25e49cab3..db65f684bb 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
@@ -54,6 +54,10 @@ class YamlFileLoader extends FileLoader
         if (isset($this->classes[$metadata->getClassName()])) {
             $yaml = $this->classes[$metadata->getClassName()];
 
+            if (isset($yaml['group_sequence_provider'])) {
+                $metadata->setGroupSequenceProvider((bool)$yaml['group_sequence_provider']);
+            }
+
             if (isset($yaml['constraints'])) {
                 foreach ($this->parseNodes($yaml['constraints']) as $constraint) {
                     $metadata->addConstraint($constraint);
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd b/src/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd
index 61232da570..6d5d3b5f95 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd
+++ b/src/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd
@@ -52,6 +52,7 @@
       ]]></xsd:documentation>
     </xsd:annotation>
     <xsd:sequence>
+      <xsd:element name="group-sequence-provider" type="group-sequence-provider" minOccurs="0" maxOccurs="1" />
       <xsd:element name="constraint" type="constraint" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="property" type="property" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="getter" type="getter" minOccurs="0" maxOccurs="unbounded" />
@@ -59,6 +60,14 @@
     <xsd:attribute name="name" type="xsd:string" use="required" />
   </xsd:complexType>
   
+  <xsd:complexType name="group-sequence-provider">
+    <xsd:annotation>
+      <xsd:documentation><![CDATA[
+        Defines the name of the group sequence provider for a class.
+      ]]></xsd:documentation>
+    </xsd:annotation>
+  </xsd:complexType>
+  
   <xsd:complexType name="property">
     <xsd:annotation>
       <xsd:documentation><![CDATA[
diff --git a/tests/Symfony/Tests/Component/Validator/Fixtures/GroupSequenceProviderEntity.php b/tests/Symfony/Tests/Component/Validator/Fixtures/GroupSequenceProviderEntity.php
new file mode 100644
index 0000000000..9b1afefd08
--- /dev/null
+++ b/tests/Symfony/Tests/Component/Validator/Fixtures/GroupSequenceProviderEntity.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Symfony\Tests\Component\Validator\Fixtures;
+
+use Symfony\Component\Validator\Constraints as Assert;
+use Symfony\Component\Validator\GroupSequenceProviderInterface;
+
+/**
+ * @Assert\GroupSequenceProvider
+ */
+class GroupSequenceProviderEntity implements GroupSequenceProviderInterface
+{
+    public $firstName;
+    public $lastName;
+
+    protected $groups = array();
+
+    public function setGroups($groups)
+    {
+        $this->groups = $groups;
+    }
+
+    public function getGroupSequence()
+    {
+        return $this->groups;
+    }
+}
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/ClassMetadataTest.php b/tests/Symfony/Tests/Component/Validator/Mapping/ClassMetadataTest.php
index 5ec7abff8b..7da676aba8 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/ClassMetadataTest.php
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/ClassMetadataTest.php
@@ -14,10 +14,12 @@ namespace Symfony\Tests\Component\Validator\Mapping;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
+use Symfony\Component\Validator\Exception\GroupDefinitionException;
 use Symfony\Tests\Component\Validator\Fixtures\Entity;
 use Symfony\Tests\Component\Validator\Fixtures\ConstraintA;
 use Symfony\Tests\Component\Validator\Fixtures\ConstraintB;
 use Symfony\Tests\Component\Validator\Fixtures\PropertyConstraint;
+use Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProvider;
 
 require_once __DIR__.'/../Fixtures/Entity.php';
 require_once __DIR__.'/../Fixtures/ConstraintA.php';
@@ -28,6 +30,7 @@ class ClassMetadataTest extends \PHPUnit_Framework_TestCase
 {
     const CLASSNAME = 'Symfony\Tests\Component\Validator\Fixtures\Entity';
     const PARENTCLASS = 'Symfony\Tests\Component\Validator\Fixtures\EntityParent';
+    const PROVIDERCLASS = 'Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity';
 
     protected $metadata;
 
@@ -189,5 +192,40 @@ class ClassMetadataTest extends \PHPUnit_Framework_TestCase
 
         $this->metadata->setGroupSequence(array('Foo', $this->metadata->getDefaultGroup(), Constraint::DEFAULT_GROUP));
     }
-}
 
+    /**
+     * @expectedException Symfony\Component\Validator\Exception\GroupDefinitionException
+     */
+    public function testGroupSequenceFailsIfGroupSequenceProviderIsSet()
+    {
+        $metadata = new ClassMetadata(self::PROVIDERCLASS);
+        $metadata->setGroupSequenceProvider(true);
+        $metadata->setGroupSequence(array('GroupSequenceProviderEntity', 'Foo'));
+    }
+
+    /**
+     * @expectedException Symfony\Component\Validator\Exception\GroupDefinitionException
+     */
+    public function testGroupSequenceProviderFailsIfGroupSequenceIsSet()
+    {
+        $metadata = new ClassMetadata(self::PROVIDERCLASS);
+        $metadata->setGroupSequence(array('GroupSequenceProviderEntity', 'Foo'));
+        $metadata->setGroupSequenceProvider(true);
+    }
+
+    /**
+     * @expectedException Symfony\Component\Validator\Exception\GroupDefinitionException
+     */
+    public function testGroupSequenceProviderFailsIfDomainClassIsInvalid()
+    {
+        $metadata = new ClassMetadata('stdClass');
+        $metadata->setGroupSequenceProvider(true);
+    }
+
+    public function testGroupSequenceProvider()
+    {
+        $metadata = new ClassMetadata(self::PROVIDERCLASS);
+        $metadata->setGroupSequenceProvider(true);
+        $this->assertTrue($metadata->isGroupSequenceProvider());
+    }
+}
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/AnnotationLoaderTest.php b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/AnnotationLoaderTest.php
index 58f215c9fa..2a6e5dbf54 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/AnnotationLoaderTest.php
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/AnnotationLoaderTest.php
@@ -144,4 +144,17 @@ class AnnotationLoaderTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($expected, $metadata);
     }
 
+    public function testLoadGroupSequenceProviderAnnotation()
+    {
+        $loader = new AnnotationLoader(new AnnotationReader());
+
+        $metadata = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+        $loader->loadClassMetadata($metadata);
+
+        $expected = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+        $expected->setGroupSequenceProvider(true);
+        $expected->getReflectionClass();
+
+        $this->assertEquals($expected, $metadata);
+    }
 }
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/XmlFileLoaderTest.php b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/XmlFileLoaderTest.php
index 8746422aac..8afae6c1ef 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/XmlFileLoaderTest.php
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/XmlFileLoaderTest.php
@@ -70,4 +70,17 @@ class XmlFileLoaderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($expected, $metadata);
     }
+
+    public function testLoadGroupSequenceProvider()
+    {
+        $loader = new XmlFileLoader(__DIR__.'/constraint-mapping.xml');
+        $metadata = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+
+        $loader->loadClassMetadata($metadata);
+
+        $expected = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+        $expected->setGroupSequenceProvider(true);
+
+        $this->assertEquals($expected, $metadata);
+    }
 }
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/YamlFileLoaderTest.php b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/YamlFileLoaderTest.php
index b661efbf94..2d1d458efe 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/YamlFileLoaderTest.php
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/YamlFileLoaderTest.php
@@ -88,4 +88,17 @@ class YamlFileLoaderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($expected, $metadata);
     }
+
+    public function testLoadGroupSequenceProvider()
+    {
+        $loader = new YamlFileLoader(__DIR__.'/constraint-mapping.yml');
+        $metadata = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+
+        $loader->loadClassMetadata($metadata);
+
+        $expected = new ClassMetadata('Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity');
+        $expected->setGroupSequenceProvider(true);
+
+        $this->assertEquals($expected, $metadata);
+    }
 }
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.xml b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.xml
index 03c2467951..916394b1bd 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.xml
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.xml
@@ -77,4 +77,11 @@
       <constraint name="NotNull" />
     </getter>
   </class>
+
+  <class name="Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity">
+
+    <!-- GROUP SEQUENCE PROVIDER -->
+    <group-sequence-provider />
+
+  </class>
 </constraint-mapping>
diff --git a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.yml b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.yml
index ea1ba6fec9..cd4b9355e1 100644
--- a/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.yml
+++ b/tests/Symfony/Tests/Component/Validator/Mapping/Loader/constraint-mapping.yml
@@ -39,3 +39,6 @@ Symfony\Tests\Component\Validator\Fixtures\Entity:
   getters:
     lastName:
       - NotNull: ~
+
+Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity:
+  group_sequence_provider: true
diff --git a/tests/Symfony/Tests/Component/Validator/ValidatorTest.php b/tests/Symfony/Tests/Component/Validator/ValidatorTest.php
index b07e596a10..19c3f7647d 100644
--- a/tests/Symfony/Tests/Component/Validator/ValidatorTest.php
+++ b/tests/Symfony/Tests/Component/Validator/ValidatorTest.php
@@ -17,6 +17,7 @@ require_once __DIR__.'/Fixtures/FailingConstraintValidator.php';
 require_once __DIR__.'/Fixtures/FakeClassMetadataFactory.php';
 
 use Symfony\Tests\Component\Validator\Fixtures\Entity;
+use Symfony\Tests\Component\Validator\Fixtures\GroupSequenceProviderEntity;
 use Symfony\Tests\Component\Validator\Fixtures\FakeClassMetadataFactory;
 use Symfony\Tests\Component\Validator\Fixtures\FailingConstraint;
 use Symfony\Component\Validator\Validator;
@@ -122,6 +123,50 @@ class ValidatorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($violations, $result);
     }
 
+    public function testValidate_groupSequenceProvider()
+    {
+        $entity = new GroupSequenceProviderEntity();
+        $metadata = new ClassMetadata(get_class($entity));
+        $metadata->addPropertyConstraint('firstName', new FailingConstraint(array(
+            'groups' => 'First',
+        )));
+        $metadata->addPropertyConstraint('lastName', new FailingConstraint(array(
+            'groups' => 'Second',
+        )));
+        $metadata->setGroupSequenceProvider(true);
+        $this->factory->addClassMetadata($metadata);
+
+        $violations = new ConstraintViolationList();
+        $violations->add(new ConstraintViolation(
+            'Failed',
+            array(),
+            $entity,
+            'firstName',
+            ''
+        ));
+
+        $entity->setGroups(array('First'));
+        $result = $this->validator->validate($entity);
+        $this->assertEquals($violations, $result);
+
+        $violations = new ConstraintViolationList();
+        $violations->add(new ConstraintViolation(
+            'Failed',
+            array(),
+            $entity,
+            'lastName',
+            ''
+        ));
+
+        $entity->setGroups(array('Second'));
+        $result = $this->validator->validate($entity);
+        $this->assertEquals($violations, $result);
+
+        $entity->setGroups(array());
+        $result = $this->validator->validate($entity);
+        $this->assertEquals(new ConstraintViolationList(), $result);
+    }
+
     public function testValidateProperty()
     {
         $entity = new Entity();