diff --git a/src/Message/Auth.php b/src/Message/Auth.php
new file mode 100644
index 0000000..2700421
--- /dev/null
+++ b/src/Message/Auth.php
@@ -0,0 +1,51 @@
+<?php
+/**
+ * This file is part of Simps
+ *
+ * @link     https://github.com/simps/mqtt
+ * @contact  Lu Fei <lufei@simps.io>
+ *
+ * For the full copyright and license information,
+ * please view the LICENSE file that was distributed with this source code
+ */
+
+declare(strict_types=1);
+
+namespace Simps\MQTT\Message;
+
+use Simps\MQTT\Hex\ReasonCode;
+use Simps\MQTT\Protocol\Types;
+use Simps\MQTT\Protocol\V5;
+
+class Auth extends AbstractMessage
+{
+    protected $code = ReasonCode::SUCCESS;
+
+    public function getCode(): int
+    {
+        return $this->code;
+    }
+
+    public function setCode(int $code): self
+    {
+        $this->code = $code;
+
+        return $this;
+    }
+
+    // AUTH type is only available in MQTT5
+    public function getContents(bool $getArray = false)
+    {
+        $buffer = [
+            'type' => Types::AUTH,
+            'code' => $this->getCode(),
+            'properties' => $this->getProperties(),
+        ];
+
+        if ($getArray) {
+            return $buffer;
+        }
+
+        return V5::pack($buffer);
+    }
+}