diff --git a/ChangeLog b/ChangeLog
index 79c389a9e..ef24f4862 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@ Version 1.0.27 (unreleased)
 
 Improvements:
 
+* Added pluggable Avatar providers
 * Improve task summary sections
 * Put back the action sidebar in task view
 * Added support for multiple placeholders for LDAP_USER_FILTER
diff --git a/app/Core/Base.php b/app/Core/Base.php
index e53f299aa..f87f271a9 100644
--- a/app/Core/Base.php
+++ b/app/Core/Base.php
@@ -41,6 +41,7 @@ use Pimple\Container;
  * @property \Kanboard\Core\Session\FlashMessage                        $flash
  * @property \Kanboard\Core\Session\SessionManager                      $sessionManager
  * @property \Kanboard\Core\Session\SessionStorage                      $sessionStorage
+ * @property \Kanboard\Core\User\Avatar\AvatarManager                   $avatarManager
  * @property \Kanboard\Core\User\GroupSync                              $groupSync
  * @property \Kanboard\Core\User\UserProfile                            $userProfile
  * @property \Kanboard\Core\User\UserSync                               $userSync
diff --git a/app/Core/User/Avatar/AvatarManager.php b/app/Core/User/Avatar/AvatarManager.php
new file mode 100644
index 000000000..4b0c52983
--- /dev/null
+++ b/app/Core/User/Avatar/AvatarManager.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Kanboard\Core\User\Avatar;
+
+/**
+ * Avatar Manager
+ *
+ * @package  user
+ * @author   Frederic Guillot
+ */
+class AvatarManager
+{
+    /**
+     * Providers
+     *
+     * @access private
+     * @var AvatarProviderInterface[]
+     */
+    private $providers = array();
+
+    /**
+     * Register a new Avatar provider
+     *
+     * @access public
+     * @param  AvatarProviderInterface $provider
+     * @return $this
+     */
+    public function register(AvatarProviderInterface $provider)
+    {
+        $this->providers[] = $provider;
+        return $this;
+    }
+
+    /**
+     * Render avatar html element
+     *
+     * @access public
+     * @param  string   $user_id
+     * @param  string   $username
+     * @param  string   $name
+     * @param  string   $email
+     * @param  int      $size
+     * @return string
+     */
+    public function render($user_id, $username, $name, $email, $size)
+    {
+        $user = array(
+            'id' => $user_id,
+            'username' => $username,
+            'name' => $name,
+            'email' => $email,
+        );
+
+        foreach ($this->providers as $provider) {
+            if ($provider->isActive($user)) {
+                return $provider->render($user, $size);
+            }
+        }
+
+        return '';
+    }
+}
diff --git a/app/Core/User/Avatar/AvatarProviderInterface.php b/app/Core/User/Avatar/AvatarProviderInterface.php
new file mode 100644
index 000000000..e0375d261
--- /dev/null
+++ b/app/Core/User/Avatar/AvatarProviderInterface.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Kanboard\Core\User\Avatar;
+
+/**
+ * Avatar Provider Interface
+ *
+ * @package  user
+ * @author   Frederic Guillot
+ */
+interface AvatarProviderInterface
+{
+    /**
+     * Render avatar html
+     *
+     * @access public
+     * @param  array $user
+     * @param  int   $size
+     */
+    public function render(array $user, $size);
+
+    /**
+     * Determine if the provider is active
+     *
+     * @access public
+     * @param  array $user
+     * @return boolean
+     */
+    public function isActive(array $user);
+}
diff --git a/app/Helper/UserHelper.php b/app/Helper/UserHelper.php
index cbdb4af89..24ac591fb 100644
--- a/app/Helper/UserHelper.php
+++ b/app/Helper/UserHelper.php
@@ -160,19 +160,18 @@ class UserHelper extends Base
     }
 
     /**
-     * Display gravatar image
+     * Display avatar
      *
      * @access public
-     * @param  string  $email
-     * @param  string  $alt
+     * @param  string   $user_id
+     * @param  string   $username
+     * @param  string   $name
+     * @param  string   $email
      * @return string
      */
-    public function avatar($email, $alt = '')
+    public function avatar($user_id, $username, $name, $email)
     {
-        if (! empty($email) && $this->config->get('integration_gravatar') == 1) {
-            return '<img class="avatar" src="https://www.gravatar.com/avatar/'.md5(strtolower($email)).'?s=25" alt="'.$this->helper->text->e($alt).'" title="'.$this->helper->text->e($alt).'">';
-        }
-
-        return '';
+        $html = $this->avatarManager->render($user_id, $username, $name, $email, 25);
+        return '<div class="avatar">'.$html.'</div>';
     }
 }
diff --git a/app/ServiceProvider/AvatarProvider.php b/app/ServiceProvider/AvatarProvider.php
new file mode 100644
index 000000000..2bbc9c034
--- /dev/null
+++ b/app/ServiceProvider/AvatarProvider.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Kanboard\ServiceProvider;
+
+use Pimple\Container;
+use Pimple\ServiceProviderInterface;
+use Kanboard\Core\User\Avatar\AvatarManager;
+use Kanboard\User\Avatar\GravatarProvider;
+
+/**
+ * Avatar Provider
+ *
+ * @package serviceProvider
+ * @author  Frederic Guillot
+ */
+class AvatarProvider implements ServiceProviderInterface
+{
+    /**
+     * Register providers
+     *
+     * @access public
+     * @param  \Pimple\Container $container
+     * @return \Pimple\Container
+     */
+    public function register(Container $container)
+    {
+        $container['avatarManager'] = new AvatarManager;
+        $container['avatarManager']->register(new GravatarProvider($container));
+        return $container;
+    }
+}
diff --git a/app/Template/comment/show.php b/app/Template/comment/show.php
index 873e14700..c5963666f 100644
--- a/app/Template/comment/show.php
+++ b/app/Template/comment/show.php
@@ -1,9 +1,7 @@
 <div class="comment <?= isset($preview) ? 'comment-preview' : '' ?>" id="comment-<?= $comment['id'] ?>">
 
     <p class="comment-title">
-        <?php if (! empty($comment['email'])): ?>
-            <?= $this->user->avatar($comment['email'], $comment['name'] ?: $comment['username']) ?>
-        <?php endif ?>
+        <?= $this->user->avatar($comment['user_id'], $comment['username'], $comment['name'], $comment['email']) ?>
 
         <?php if (! empty($comment['username'])): ?>
             <span class="comment-username"><?= $this->text->e($comment['name'] ?: $comment['username']) ?></span> @
diff --git a/app/Template/event/comment_create.php b/app/Template/event/comment_create.php
index 063736b38..43c521cf6 100644
--- a/app/Template/event/comment_create.php
+++ b/app/Template/event/comment_create.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s commented the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/comment_update.php b/app/Template/event/comment_update.php
index 93f24d8a6..80a330315 100644
--- a/app/Template/event/comment_update.php
+++ b/app/Template/event/comment_update.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s updated a comment on the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/events.php b/app/Template/event/events.php
index bbb01be49..097da3189 100644
--- a/app/Template/event/events.php
+++ b/app/Template/event/events.php
@@ -16,7 +16,16 @@
                 <?php endif ?>
                 &nbsp;<?= $this->dt->datetime($event['date_creation']) ?>
             </p>
-            <div class="activity-content"><?= $event['event_content'] ?></div>
+            <div class="activity-content">
+                <?= $this->user->avatar(
+                    $event['creator_id'],
+                    $event['author_username'],
+                    $event['author_name'],
+                    $event['email']
+                ) ?>
+
+                <?= $event['event_content'] ?>
+            </div>
         </div>
     <?php endforeach ?>
 
diff --git a/app/Template/event/subtask_create.php b/app/Template/event/subtask_create.php
index 532783d5a..ae6ddd44f 100644
--- a/app/Template/event/subtask_create.php
+++ b/app/Template/event/subtask_create.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s created a subtask for the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/subtask_update.php b/app/Template/event/subtask_update.php
index e9ff6ac61..1d560fb05 100644
--- a/app/Template/event/subtask_update.php
+++ b/app/Template/event/subtask_update.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s updated a subtask for the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/task_assignee_change.php b/app/Template/event/task_assignee_change.php
index 580176c7e..6964a50e5 100644
--- a/app/Template/event/task_assignee_change.php
+++ b/app/Template/event/task_assignee_change.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?php $assignee = $task['assignee_name'] ?: $task['assignee_username'] ?>
 
diff --git a/app/Template/event/task_close.php b/app/Template/event/task_close.php
index 361458d38..2ba77156c 100644
--- a/app/Template/event/task_close.php
+++ b/app/Template/event/task_close.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s closed the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/task_create.php b/app/Template/event/task_create.php
index 655bf8f31..21facc9ec 100644
--- a/app/Template/event/task_create.php
+++ b/app/Template/event/task_create.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s created the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/task_file_create.php b/app/Template/event/task_file_create.php
index 61bf3d61f..837f5dc09 100644
--- a/app/Template/event/task_file_create.php
+++ b/app/Template/event/task_file_create.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s attached a new file to the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/task_move_column.php b/app/Template/event/task_move_column.php
index 904c956cc..b9ae65ccc 100644
--- a/app/Template/event/task_move_column.php
+++ b/app/Template/event/task_move_column.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s moved the task %s to the column "%s"',
             $this->text->e($author),
diff --git a/app/Template/event/task_move_position.php b/app/Template/event/task_move_position.php
index 6580bb79b..dbe73f4b0 100644
--- a/app/Template/event/task_move_position.php
+++ b/app/Template/event/task_move_position.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s moved the task %s to the position #%d in the column "%s"',
             $this->text->e($author),
diff --git a/app/Template/event/task_move_swimlane.php b/app/Template/event/task_move_swimlane.php
index 9ffa554c3..b0635a067 100644
--- a/app/Template/event/task_move_swimlane.php
+++ b/app/Template/event/task_move_swimlane.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?php if ($task['swimlane_id'] == 0): ?>
         <?= e('%s moved the task %s to the first swimlane',
diff --git a/app/Template/event/task_open.php b/app/Template/event/task_open.php
index 9db2e3c97..ce92bb18c 100644
--- a/app/Template/event/task_open.php
+++ b/app/Template/event/task_open.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s opened the task %s',
             $this->text->e($author),
diff --git a/app/Template/event/task_update.php b/app/Template/event/task_update.php
index 72d704956..83f1661b9 100644
--- a/app/Template/event/task_update.php
+++ b/app/Template/event/task_update.php
@@ -1,5 +1,3 @@
-<?= $this->user->avatar($email, $author) ?>
-
 <p class="activity-title">
     <?= e('%s updated the task %s',
             $this->text->e($author),
diff --git a/app/User/Avatar/GravatarProvider.php b/app/User/Avatar/GravatarProvider.php
new file mode 100644
index 000000000..10ab43900
--- /dev/null
+++ b/app/User/Avatar/GravatarProvider.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Kanboard\User\Avatar;
+
+use Kanboard\Core\Base;
+use Kanboard\Core\User\Avatar\AvatarProviderInterface;
+
+class GravatarProvider extends Base implements AvatarProviderInterface
+{
+    /**
+     * Render avatar html
+     *
+     * @access public
+     * @param array $user
+     * @param int   $size
+     */
+    public function render(array $user, $size)
+    {
+        $url = sprintf('https://www.gravatar.com/avatar/%s?s=%d', md5(strtolower($user['email'])), $size);
+        $title = $this->helper->text->e($user['name'] ?: $user['username']);
+        return '<img src="'.$url.'" alt="'.$title.'" title="'.$title.'">';
+    }
+
+    /**
+     * Determine if the provider is active
+     *
+     * @access public
+     * @param  array $user
+     * @return boolean
+     */
+    public function isActive(array $user)
+    {
+        return !empty($user['email']) && $this->config->get('integration_gravatar') == 1;
+    }
+}
diff --git a/app/common.php b/app/common.php
index 71f80c751..7dbd75870 100644
--- a/app/common.php
+++ b/app/common.php
@@ -38,4 +38,5 @@ $container->register(new Kanboard\ServiceProvider\GroupProvider);
 $container->register(new Kanboard\ServiceProvider\RouteProvider);
 $container->register(new Kanboard\ServiceProvider\ActionProvider);
 $container->register(new Kanboard\ServiceProvider\ExternalLinkProvider);
+$container->register(new Kanboard\ServiceProvider\AvatarProvider);
 $container->register(new Kanboard\ServiceProvider\PluginProvider);
diff --git a/doc/plugin-avatar-provider.markdown b/doc/plugin-avatar-provider.markdown
new file mode 100644
index 000000000..62941e5c2
--- /dev/null
+++ b/doc/plugin-avatar-provider.markdown
@@ -0,0 +1,32 @@
+Adding a new Avatar Provider
+=============================
+
+Registration
+------------
+
+```php
+$this->avatarManager->register(new CustomAvatarProvider());
+```
+
+Interface
+---------
+
+The provider must implements the interface `Kanboard\Core\User\Avatar\AvatarProviderInterface`:
+
+
+| Method                        | Description                                                   |
+|-------------------------------|---------------------------------------------------------------|
+| `render(array $user, $size)`  | Render HTML                                                   |
+| `isActive(array $user)`       | Returns a boolean if the provider is able to render something |
+
+
+The `$user` argument is a dictionary that contains these keys:
+
+```php
+[
+    'id' => 123,
+    'username' => 'admin',
+    'name' => 'Administrator',
+    'email' => 'me@localhost',
+]
+```
diff --git a/doc/plugins.markdown b/doc/plugins.markdown
index e38c887fa..475bc2497 100644
--- a/doc/plugins.markdown
+++ b/doc/plugins.markdown
@@ -20,9 +20,10 @@ Plugin creators should specify explicitly the compatible versions of Kanboard. I
 - [Attach metadata to users, tasks and projects](plugin-metadata.markdown)
 - [Authentication architecture](plugin-authentication-architecture.markdown)
 - [Authentication plugin registration](plugin-authentication.markdown)
-- [Authorization Architecture](plugin-authorization-architecture.markdown)
-- [Custom Group Providers](plugin-group-provider.markdown)
-- [External Link Providers](plugin-external-link.markdown)
+- [Authorization architecture](plugin-authorization-architecture.markdown)
+- [Custom group providers](plugin-group-provider.markdown)
+- [External link providers](plugin-external-link.markdown)
+- [Add avatar providers](plugin-avatar-provider.markdown)
 - [LDAP client](plugin-ldap-client.markdown)
 
 Examples of plugins