diff --git a/CHANGELOG.md b/CHANGELOG.md
index 081ee974..095267e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## Added
 - Support for many tags (filter dictionaries)
 - The registry can now be autowired
+- Implement CombinedDictionary. Allow to merge different dictionaries into one
 
 ## Changed
 - Category is now called tag #34
diff --git a/spec/Knp/DictionaryBundle/Dictionary/CombinedSpec.php b/spec/Knp/DictionaryBundle/Dictionary/CombinedSpec.php
new file mode 100644
index 00000000..204e967a
--- /dev/null
+++ b/spec/Knp/DictionaryBundle/Dictionary/CombinedSpec.php
@@ -0,0 +1,126 @@
+<?php
+
+declare(strict_types=1);
+
+namespace spec\Knp\DictionaryBundle\Dictionary;
+
+use ArrayIterator;
+use Knp\DictionaryBundle\Dictionary;
+use PhpSpec\ObjectBehavior;
+
+class CombinedSpec extends ObjectBehavior
+{
+    function let(Dictionary $dictionary1, Dictionary $dictionary2, Dictionary $dictionary3)
+    {
+        $this->beConstructedWith('combined_dictionary', [
+            $dictionary1,
+            $dictionary2,
+            $dictionary3,
+        ]);
+    }
+
+    function it_is_initializable()
+    {
+        $this->shouldHaveType(Dictionary\Combined::class);
+    }
+
+    function it_is_a_dictionary()
+    {
+        $this->shouldImplement(Dictionary::class);
+    }
+
+    function it_access_to_value_like_an_array($dictionary1, $dictionary2, $dictionary3)
+    {
+        $dictionary1->getIterator()->willReturn(new ArrayIterator(['foo1' => 'foo10']));
+
+        $dictionary2->getIterator()->willReturn(new ArrayIterator(['bar1' => 'bar10']));
+
+        $dictionary3->getIterator()->willReturn(new ArrayIterator(['baz1' => 'baz10']));
+
+        $this['foo1']->shouldBe('foo10');
+        $this['bar1']->shouldBe('bar10');
+        $this['baz1']->shouldBe('baz10');
+    }
+
+    function it_getvalues_should_return_dictionaries_values($dictionary1, $dictionary2, $dictionary3)
+    {
+        $dictionary1->getIterator()->willReturn(new ArrayIterator([
+            'foo1' => 'foo10',
+            'foo2' => 'foo20',
+        ]));
+
+        $dictionary2->getIterator()->willReturn(new ArrayIterator([
+            'bar1' => 'bar10',
+            'bar2' => 'bar20',
+        ]));
+
+        $dictionary3->getIterator()->willReturn(new ArrayIterator([
+            'foo1' => 'baz10',
+            'bar2' => 'baz20',
+        ]));
+
+        $this->getKeys()->shouldReturn([
+            'foo1',
+            'foo2',
+            'bar1',
+            'bar2',
+        ]);
+        $this->getValues()->shouldReturn([
+            'foo1' => 'baz10',
+            'foo2' => 'foo20',
+            'bar1' => 'bar10',
+            'bar2' => 'baz20',
+        ]);
+    }
+
+    function it_can_iterate_over_dictionaries($dictionary1, $dictionary2, $dictionary3)
+    {
+        $dictionary1->getIterator()->willReturn(new ArrayIterator([
+            'foo1' => 'foo10',
+            'foo2' => 'foo20',
+        ]));
+
+        $dictionary2->getIterator()->willReturn(new ArrayIterator([
+            'bar1' => 'bar10',
+            'bar2' => 'bar20',
+        ]));
+
+        $dictionary3->getIterator()->willReturn(new ArrayIterator([
+            'foo2' => 'baz20',
+            'bar2' => 'baz20',
+        ]));
+
+        $this->shouldIterateLike([
+            'foo1' => 'foo10',
+            'foo2' => 'baz20',
+            'bar1' => 'bar10',
+            'bar2' => 'baz20',
+        ]);
+    }
+
+    function it_sums_the_count_of_elements($dictionary1, $dictionary2, $dictionary3)
+    {
+        $dictionary1->getIterator()->willReturn(new ArrayIterator([
+            'foo1' => 'foo10',
+        ]));
+
+        $dictionary2->getIterator()->willReturn(new ArrayIterator([
+            'bar1' => 'bar10',
+            'bar2' => 'bar20',
+        ]));
+
+        $dictionary3->getIterator()->willReturn(new ArrayIterator([
+            'baz1' => 'baz10',
+            'baz2' => 'baz20',
+            'baz3' => 'baz30',
+            'baz4' => 'baz40',
+        ]));
+
+        $this->count()->shouldReturn(7);
+    }
+
+    function its_getname_should_return_dictionary_name()
+    {
+        $this->getName()->shouldReturn('combined_dictionary');
+    }
+}
diff --git a/spec/Knp/DictionaryBundle/Dictionary/Factory/CombinedSpec.php b/spec/Knp/DictionaryBundle/Dictionary/Factory/CombinedSpec.php
new file mode 100644
index 00000000..aa6ac18a
--- /dev/null
+++ b/spec/Knp/DictionaryBundle/Dictionary/Factory/CombinedSpec.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace spec\Knp\DictionaryBundle\Dictionary\Factory;
+
+use ArrayIterator;
+use Knp\DictionaryBundle\Dictionary;
+use PhpSpec\ObjectBehavior;
+
+class CombinedSpec extends ObjectBehavior
+{
+    function let()
+    {
+        $this->beConstructedWith(new Dictionary\DictionaryRegistry());
+    }
+
+    function it_is_initializable()
+    {
+        $this->shouldHaveType(Dictionary\Factory\Combined::class);
+    }
+
+    function it_is_a_factory()
+    {
+        $this->shouldHaveType(Dictionary\Factory::class);
+    }
+
+    function it_supports_specific_config()
+    {
+        $this->supports(['type' => 'combined'])->shouldReturn(true);
+    }
+
+    function it_creates_a_dictionary(Dictionary $dictionary1, Dictionary $dictionary2, Dictionary $dictionary3)
+    {
+        $dictionary1->getIterator()->willReturn(new ArrayIterator(['foo1' => 'foo10', 'foo2' => 'foo20']));
+        $dictionary1->getName()->willReturn('dictionary1');
+
+        $dictionary2->getIterator()->willReturn(new ArrayIterator(['bar1' => 'bar10', 'bar2' => 'bar20']));
+        $dictionary2->getName()->willReturn('dictionary2');
+
+        $dictionary3->getIterator()->willReturn(new ArrayIterator(['foo2' => 'baz20', 'bar2' => 'baz20']));
+        $dictionary3->getName()->willReturn('dictionary3');
+
+        $registry = new Dictionary\DictionaryRegistry();
+        $registry->add($dictionary1->getWrappedObject());
+        $registry->add($dictionary2->getWrappedObject());
+        $registry->add($dictionary3->getWrappedObject());
+        $this->beConstructedWith($registry);
+
+        $config = [
+            'type'         => 'combined',
+            'dictionaries' => [
+                'dictionary1',
+                'dictionary2',
+                'dictionary3',
+            ],
+        ];
+
+        $dictionary = $this->create('combined_dictionary', $config);
+
+        $dictionary->getValues()->shouldReturn([
+            'foo1' => 'foo10',
+            'foo2' => 'baz20',
+            'bar1' => 'bar10',
+            'bar2' => 'baz20',
+        ]);
+    }
+}
diff --git a/src/Knp/DictionaryBundle/Dictionary/Combined.php b/src/Knp/DictionaryBundle/Dictionary/Combined.php
new file mode 100644
index 00000000..a3556acd
--- /dev/null
+++ b/src/Knp/DictionaryBundle/Dictionary/Combined.php
@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Knp\DictionaryBundle\Dictionary;
+
+use Knp\DictionaryBundle\Dictionary;
+
+final class Combined implements Dictionary
+{
+    /**
+     * @var CallableDictionary
+     */
+    private $dictionary;
+
+    public function __construct(string $name, array $dictionaries)
+    {
+        $this->dictionary = new CallableDictionary($name, function () use ($dictionaries) {
+            $data = [];
+
+            foreach ($dictionaries as $dictionary) {
+                $data = $this->merge($data, iterator_to_array($dictionary));
+            }
+
+            return $data;
+        });
+    }
+
+    public function getName(): string
+    {
+        return $this->dictionary->getName();
+    }
+
+    public function getValues(): array
+    {
+        return $this->dictionary->getValues();
+    }
+
+    public function getKeys(): array
+    {
+        return $this->dictionary->getKeys();
+    }
+
+    public function offsetExists($offset)
+    {
+        return $this->dictionary->offsetExists($offset);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->dictionary->offsetGet($offset);
+    }
+
+    public function offsetSet($offset, $value): void
+    {
+        $this->dictionary->offsetSet($offset, $value);
+    }
+
+    public function offsetUnset($offset): void
+    {
+        $this->dictionary->offsetUnset($offset);
+    }
+
+    public function count(): int
+    {
+        return \count($this->dictionary->getValues());
+    }
+
+    public function getIterator()
+    {
+        return $this->dictionary->getIterator();
+    }
+
+    private function merge(array $array1, array $array2): array
+    {
+        if ($array1 === array_values($array1) && $array2 === array_values($array2)) {
+            return array_merge($array1, $array2);
+        }
+
+        $data = [];
+
+        foreach ([$array1, $array2] as $array) {
+            foreach ($array as $key => $value) {
+                $data[$key] = $value;
+            }
+        }
+
+        return $data;
+    }
+}
diff --git a/src/Knp/DictionaryBundle/Dictionary/Factory/Combined.php b/src/Knp/DictionaryBundle/Dictionary/Factory/Combined.php
new file mode 100644
index 00000000..4b49e016
--- /dev/null
+++ b/src/Knp/DictionaryBundle/Dictionary/Factory/Combined.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Knp\DictionaryBundle\Dictionary\Factory;
+
+use InvalidArgumentException;
+use Knp\DictionaryBundle\Dictionary;
+use Knp\DictionaryBundle\Dictionary\DictionaryRegistry;
+
+class Combined implements Dictionary\Factory
+{
+    const TYPE = 'combined';
+
+    /**
+     * @var Dictionary\DictionaryRegistry
+     */
+    private $dictionaries;
+
+    public function __construct(DictionaryRegistry $dictionaries)
+    {
+        $this->dictionaries = $dictionaries;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function create($name, array $config): Dictionary
+    {
+        if (!isset($config['dictionaries'])) {
+            throw new InvalidArgumentException(sprintf(
+                'Dictionary of type %s must contains a key "dictionaries".',
+                self::TYPE
+            ));
+        }
+
+        $dictionaries = array_map(function ($name) {
+            return $this->dictionaries[$name];
+        }, $config['dictionaries']);
+
+        return new Dictionary\Combined($name, $dictionaries);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supports(array $config): bool
+    {
+        return isset($config['type']) ? self::TYPE === $config['type'] : false;
+    }
+}