diff --git a/lib/Doctrine/ORM/Event/PreFlushEventArgs.php b/lib/Doctrine/ORM/Event/PreFlushEventArgs.php
new file mode 100644
index 000000000..8ed39b6cb
--- /dev/null
+++ b/lib/Doctrine/ORM/Event/PreFlushEventArgs.php
@@ -0,0 +1,56 @@
+<?php
+/*
+ *  $Id$
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.doctrine-project.org>.
+*/
+
+namespace Doctrine\ORM\Event;
+
+/**
+ * Provides event arguments for the preFlush event.
+ *
+ * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link        www.doctrine-project.com
+ * @since       2.0
+ * @version     $Revision$
+ * @author      Roman Borschel <roman@code-factory.de>
+ * @author      Benjamin Eberlei <kontakt@beberlei.de>
+ */
+class PreFlushEventArgs extends \Doctrine\Common\EventArgs
+{
+    /**
+     * @var EntityManager
+     */
+    private $_em;
+
+    //private $_entitiesToPersist = array();
+    //private $_entitiesToRemove = array();
+
+    public function __construct($em)
+    {
+        $this->_em = $em;
+    }
+
+    /**
+     * @return EntityManager
+     */
+    public function getEntityManager()
+    {
+        return $this->_em;
+    }
+}
diff --git a/lib/Doctrine/ORM/Events.php b/lib/Doctrine/ORM/Events.php
index e8c350aa6..8af7a9b61 100644
--- a/lib/Doctrine/ORM/Events.php
+++ b/lib/Doctrine/ORM/Events.php
@@ -109,6 +109,13 @@ final class Events
      */
     const loadClassMetadata = 'loadClassMetadata';
     
+    /**
+     * The preFlush event occurs when the EntityManager#flush() operation is invoked,
+     * but before any changes to managed entites have been calculated. This event is
+     * always raised right after EntityManager#flush() call.
+     */
+    const preFlush = 'preFlush';
+
     /**
      * The onFlush event occurs when the EntityManager#flush() operation is invoked,
      * after any changes to managed entities have been determined but before any
diff --git a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
index 36e3dcb01..b09cabc95 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
@@ -446,6 +446,10 @@ class AnnotationDriver implements Driver
                     if (isset($annotations['Doctrine\ORM\Mapping\PostLoad'])) {
                         $metadata->addLifecycleCallback($method->getName(), \Doctrine\ORM\Events::postLoad);
                     }
+
+                    if (isset($annotations['Doctrine\ORM\Mapping\PreFlush'])) {
+                        $metadata->addLifecycleCallback($method->getName(), \Doctrine\ORM\Events::preFlush);
+                    }
                 }
             }
         }
diff --git a/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php b/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php
index e471a0d71..7f25ecbb1 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php
@@ -387,3 +387,9 @@ final class PostRemove implements Annotation {}
  * @Target("METHOD")
  */
 final class PostLoad implements Annotation {}
+
+/**
+ * @Annotation
+ * @Target("METHOD")
+ */
+final class PreFlush implements Annotation {}
diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index 4366250dd..d8b640c47 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -259,6 +259,41 @@ class UnitOfWork implements PropertyChangedListener
      */
     public function commit($entity = null)
     {
+        // Run preFlush lifecycle callback for new entities
+        foreach ($this->entityInsertions as $classEntity) {
+            $class = $this->em->getClassMetadata(get_class($classEntity));
+
+            // Skip class if instances are read-only
+            if ($class->isReadOnly) {
+                continue;
+            }
+
+            if (isset($class->lifecycleCallbacks[Events::preFlush])) {
+                $class->invokeLifecycleCallbacks(Events::preFlush, $classEntity);
+            }
+        }
+
+        // Run preFlush lifecycle callback for persisted entities
+        foreach ($this->identityMap as $className => $classEntities) {
+            $class = $this->em->getClassMetadata($className);
+
+            // Skip class if instances are read-only
+            if ($class->isReadOnly) {
+                continue;
+            }
+
+            if (isset($class->lifecycleCallbacks[Events::preFlush])) {
+                foreach ($classEntities as $classEntity) {
+                    $class->invokeLifecycleCallbacks(Events::preFlush, $classEntity);
+                }
+            }
+        }
+
+        // Raise preFlush
+        if ($this->evm->hasListeners(Events::preFlush)) {
+            $this->evm->dispatchEvent(Events::preFlush, new Event\PreFlushEventArgs($this->em));
+        }
+
         // Compute changes done since last commit.
         if ($entity === null) {
             $this->computeChangeSets();