diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index 0c7581e7c0b7d..d4fbc0d57da1e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 3.4.0
 -----
 
+ * Added `DotenvDataCollector` to collect envs loaded by the Dotenv component
  * Deprecated `profiler.matcher` option
  * Added support for `EventSubscriberInterface` on `MicroKernelTrait`
  * Removed `doctrine/cache` from the list of required dependencies in `composer.json`
diff --git a/src/Symfony/Bundle/FrameworkBundle/DataCollector/DotenvDataCollector.php b/src/Symfony/Bundle/FrameworkBundle/DataCollector/DotenvDataCollector.php
new file mode 100644
index 0000000000000..8f29884490ffe
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/DataCollector/DotenvDataCollector.php
@@ -0,0 +1,58 @@
+<?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\Bundle\FrameworkBundle\DataCollector;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DataCollector;
+
+/**
+ * Collects environment variables loaded by the Dotenv component.
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ */
+class DotenvDataCollector extends DataCollector
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function collect(Request $request, Response $response, \Exception $exception = null)
+    {
+        $this->data['envs'] = array();
+
+        $loadedVars = array_filter(explode(',', getenv('SYMFONY_DOTENV_VARS')));
+
+        foreach ($loadedVars as $var) {
+            if (false !== getenv($var)) {
+                $this->data['envs'][$var] = getenv($var);
+            }
+        }
+    }
+
+    /**
+     * Gets loaded environment variables.
+     *
+     * @return array
+     */
+    public function getEnvs()
+    {
+        return $this->data['envs'];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'dotenv';
+    }
+}
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
index a1b73097e0bd7..011a71ed8963d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
@@ -51,5 +51,9 @@
             <tag name="kernel.event_listener" event="kernel.controller" method="onKernelController"/>
             <tag name="data_collector" template="@WebProfiler/Collector/router.html.twig" id="router" priority="285" />
         </service>
+
+        <service id="data_collector.dotenv" class="Symfony\Bundle\FrameworkBundle\DataCollector\DotenvDataCollector">
+            <tag name="data_collector" id="dotenv" />
+        </service>
     </services>
 </container>
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DataCollector/DotenvDataCollectorTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DataCollector/DotenvDataCollectorTest.php
new file mode 100644
index 0000000000000..c4d4c725ffdad
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DataCollector/DotenvDataCollectorTest.php
@@ -0,0 +1,44 @@
+<?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\Bundle\FrameworkBundle\Tests\DataCollector;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\DataCollector\DotenvDataCollector;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class DotenvDataCollectorTest extends TestCase
+{
+    public function testCollect()
+    {
+        putenv('SYMFONY_DOTENV_VARS=APP_DEBUG,DATABASE_URL,DELETED_VAR');
+
+        putenv('APP_DEBUG=1');
+        putenv('DATABASE_URL=sqlite:///var/data/db.sqlite');
+        putenv('DELETED_VAR');
+
+        $collector = new DotenvDataCollector();
+        $collector->collect(new Request(), new Response());
+
+        $this->assertEquals(array('APP_DEBUG' => '1', 'DATABASE_URL' => 'sqlite:///var/data/db.sqlite'), $collector->getEnvs());
+    }
+
+    public function testSpecialVariableNotExists()
+    {
+        putenv('SYMFONY_DOTENV_VARS');
+
+        $collector = new DotenvDataCollector();
+        $collector->collect(new Request(), new Response());
+
+        $this->assertEmpty($collector->getEnvs());
+    }
+}
diff --git a/src/Symfony/Bundle/WebProfilerBundle/CHANGELOG.md b/src/Symfony/Bundle/WebProfilerBundle/CHANGELOG.md
index c1259b0a20e1d..c0a1adc56c92a 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/WebProfilerBundle/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 3.4.0
 -----
 
+ * added a pane with envs loaded by the Dotenv component
  * Deprecated the `web_profiler.position` config option (in 4.0 version the toolbar
    will always be displayed at the bottom) and the `web_profiler.debug_toolbar.position`
    container parameter.
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/request.html.twig b/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/request.html.twig
index 5fe45a0f4ed39..9b51bc357e2e6 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/request.html.twig
+++ b/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/request.html.twig
@@ -249,6 +249,24 @@
             </div>
         </div>
 
+        {% if profile.hasCollector('dotenv') %}
+        <div class="tab {{ profile.collector('dotenv').envs is empty ? 'disabled' }}">
+              <h3 class="tab-title">.env</h3>
+
+              <div class="tab-content">
+                  <h3>Loaded variables</h3>
+
+                  {% if profile.collector('dotenv').envs is empty %}
+                      <div class="empty">
+                          <p>No variables were loaded.</p>
+                      </div>
+                  {% else %}
+                      {{ include('@WebProfiler/Profiler/table.html.twig', { data: profile.collector('dotenv').envs }, with_context = false) }}
+                  {% endif %}
+              </div>
+        </div>
+        {% endif %}
+
         {% if profile.parent %}
         <div class="tab">
             <h3 class="tab-title">Parent Request</h3>