diff --git a/app/config/providers.php b/app/config/providers.php
index 9a84950ac..f8c587b43 100644
--- a/app/config/providers.php
+++ b/app/config/providers.php
@@ -46,6 +46,11 @@ return [
         'icon' => 'icon-linkedin',
         'enabled' => true,
     ],
+    'slack' => [
+        'developers' => 'https://api.slack.com/',
+        'icon' => 'icon-slack',
+        'enabled' => true,
+    ],
     'dropbox' => [
         'developers' => 'https://www.dropbox.com/developers/documentation',
         'icon' => 'icon-dropbox',
diff --git a/public/images/oauth/slack.png b/public/images/oauth/slack.png
new file mode 100644
index 000000000..9de2cbc5b
Binary files /dev/null and b/public/images/oauth/slack.png differ
diff --git a/src/Auth/OAuth/Slack.php b/src/Auth/OAuth/Slack.php
new file mode 100644
index 000000000..120dd4233
--- /dev/null
+++ b/src/Auth/OAuth/Slack.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Auth\OAuth;
+
+use Auth\OAuth;
+
+class Slack extends OAuth
+{
+    /**
+     * @var array
+     */
+    protected $user = [];
+
+    /**
+     * @return string
+     */
+    public function getName():string
+    {
+        return 'slack';
+    }
+
+    /**
+     * @return string
+     */
+    public function getLoginURL():string
+    {
+        // https://api.slack.com/docs/oauth#step_1_-_sending_users_to_authorize_and_or_install
+        return 'https://slack.com/oauth/authorize'.
+            '?client_id='.urlencode($this->appID).
+            '&scope=identity.avatar+identity.basic+identity.email+identity.team'.
+            '&redirect_uri='.urlencode($this->callback).
+            '&state='.urlencode(json_encode($this->state));
+    }
+
+    /**
+     * @param string $code
+     *
+     * @return string
+     */
+    public function getAccessToken(string $code):string
+    {
+        // https://api.slack.com/docs/oauth#step_3_-_exchanging_a_verification_code_for_an_access_token
+        $accessToken = $this->request(
+            'GET',
+            'https://slack.com/api/oauth.access'.
+            '?client_id='.urlencode($this->appID).
+            '&client_secret='.urlencode($this->appSecret).
+            '&code='.urlencode($code).
+            '&redirect_uri='.urlencode($this->callback)
+        );
+
+        $accessToken = json_decode($accessToken, true); //
+
+        if (isset($accessToken['access_token'])) {
+            return $accessToken['access_token'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserID(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['id'])) {
+            return $user['user']['id'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserEmail(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['email'])) {
+            return $user['user']['email'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserName(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['name'])) {
+            return $user['user']['name'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return array
+     */
+    protected function getUser(string $accessToken):array
+    {
+
+        if (empty($this->user)) {
+            // https://api.slack.com/methods/users.identity
+            $user = $this->request(
+                'GET',
+                'https://slack.com/api/users.identity?token='.urlencode($accessToken),
+            );
+
+            $this->user = json_decode($user, true);
+        }
+
+        return $this->user;
+    }
+}