diff --git a/README.md b/README.md
index 66098bc..436eadd 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,8 @@ Features
   - `ezuser:enable` to enable a user
   - `ezplatform:language:add` to add a language to the database
   - `ezplatform:slug:test` to test transformation of text into slug
+* Workflows
+  - `notify_user` action: Notify users passed as a data list of user IDs, user group IDs, user logins and/or user emails.
 
 
 Contribute
diff --git a/src/bundle/EventListener/NotifyUserActionListener.php b/src/bundle/EventListener/NotifyUserActionListener.php
new file mode 100644
index 0000000..5f0472e
--- /dev/null
+++ b/src/bundle/EventListener/NotifyUserActionListener.php
@@ -0,0 +1,149 @@
+<?php
+
+namespace AdrienDupuis\EzPlatformAdminBundle\EventListener;
+
+use eZ\Publish\API\Repository\Exceptions\NotFoundException;
+use eZ\Publish\API\Repository\NotificationService;
+use eZ\Publish\API\Repository\PermissionResolver;
+use eZ\Publish\API\Repository\UserService;
+use eZ\Publish\API\Repository\Values\Content\Content;
+use eZ\Publish\API\Repository\Values\Notification\CreateStruct;
+use eZ\Publish\API\Repository\Values\User\User;
+use eZ\Publish\API\Repository\Values\User\UserGroup;
+use EzSystems\EzPlatformWorkflow\Event\Action\AbstractStageWorkflowActionListener;
+use EzSystems\EzPlatformWorkflow\MarkingStore\ContextualMarking;
+use Symfony\Component\Workflow\Event\EnteredEvent;
+
+class NotifyUserActionListener extends AbstractStageWorkflowActionListener
+{
+    /** @var UserService */
+    private $userService;
+
+    /** @var NotificationService */
+    private $notificationService;
+
+    /** @var PermissionResolver */
+    private $permissionResolver;
+
+    public function __construct(
+        UserService $userService,
+        NotificationService $notificationService,
+        PermissionResolver $permissionResolver
+    ) {
+        $this->userService = $userService;
+        $this->notificationService = $notificationService;
+        $this->permissionResolver = $permissionResolver;
+    }
+
+    public function getIdentifier(): string
+    {
+        return 'notify_user';
+    }
+
+    public function onWorkflowEvent(EnteredEvent $event): void
+    {
+        $marking = $event->getWorkflow()->getMarkingStore()->getMarking($event->getSubject());
+
+        if (!$marking instanceof ContextualMarking) {
+            return;
+        }
+
+        /** @var Content $content */
+        $content = $event->getSubject();
+        $versionInfo = $content->getVersionInfo();
+
+        $context = $marking->getContext();
+
+        $sender = $this->userService->loadUser(
+            $this->permissionResolver->getCurrentUserReference()->getUserId()
+        );
+
+        $userIdList = [];
+
+        if (!empty($context->reviewerId)) {
+            $userIdList[] = $context->reviewerId;
+        }
+
+        foreach (array_keys($event->getMarking()->getPlaces()) as $place) {
+            foreach ($event->getWorkflow()->getMetadataStore()->getPlaceMetadata($place)['actions'][$this->getIdentifier()]['data'] as $id) {
+                foreach ($this->getUserList($id) as $user) {
+                    $userIdList[] = $user->id;
+                }
+            }
+        }
+
+        foreach (array_unique($userIdList, SORT_NUMERIC) as $userId) {
+            $notification = new CreateStruct();
+            $notification->ownerId = $userId;
+            $notification->type = 'Workflow:NotifyReviewer';
+            $notification->data = [
+                'content_id' => $content->id,
+                'content_name' => $content->getName(),
+                'version_number' => $versionInfo->versionNo,
+                'language_code' => $versionInfo->initialLanguageCode,
+                'sender_id' => $sender->id,
+                'sender_name' => $sender->getName(),
+                'message' => $context->message,
+            ];
+
+            $this->notificationService->createNotification($notification);
+        }
+    }
+
+    /**
+     * @param $id int|string User ID, user group ID, user login or user email
+     *
+     * @return User[]
+     */
+    public function getUserList($id)
+    {
+        $userList = [];
+
+        if (is_int($id)) {
+            try {
+                $userGroup = $this->userService->loadUserGroup($id);
+                $userList = array_merge($userList, $this->loadUsersOfUserGroup($userGroup));
+            } catch (NotFoundException $groupNotFoundException) {
+                try {
+                    $userList[] = $this->userService->loadUser($id);
+                } catch (NotFoundException $userNotFoundException) {
+                    //TODO
+                }
+            }
+        } elseif (is_string($id)) {
+            if (false === strpos($user, '@')) {
+                try {
+                    $userList[] = $this->userService->loadUserByLogin($user);
+                } catch (NotFoundException $userNotFoundException) {
+                    //TODO
+                }
+            } else {
+                try {
+                    $userList[] = $this->userService->loadUserByEmail($user);
+                } catch (NotFoundException $userNotFoundException) {
+                    //TODO
+                }
+            }
+        }
+
+        return $userList;
+    }
+
+    /** @return User[] */
+    public function loadUsersOfUserGroup(UserGroup $userGroup): array
+    {
+        $users = [];
+
+        for ($offset = 0, $limit = 25; count($usersSlice = $this->userService->loadUsersOfUserGroup($userGroup, $offset, $limit)); $offset += $limit) {
+            $users = array_merge($users, $usersSlice);
+        }
+
+        for ($offset = 0, $limit = 25; count($subUserGroupsSlice = $this->userService->loadSubUserGroups($userGroup, $offset, $limit)); $offset += $limit) {
+            foreach ($subUserGroupsSlice as $subUserGroup) {
+                $users = array_merge($users, $this->loadUsersOfUserGroup($subUserGroup));
+            }
+        }
+
+        return $users;
+    }
+}
diff --git a/src/bundle/Resources/config/services/action_listeners.yaml b/src/bundle/Resources/config/services/action_listeners.yaml
new file mode 100644
index 0000000..4e3f59d
--- /dev/null
+++ b/src/bundle/Resources/config/services/action_listeners.yaml
@@ -0,0 +1,8 @@
+services:
+    AdrienDupuis\EzPlatformAdminBundle\EventListener\NotifyUserActionListener:
+        arguments:
+            - '@ezpublish.api.service.user'
+            - '@ezpublish.api.service.notification'
+            - '@ezpublish.api.service.permissions_resolver'
+        tags:
+            - { name: ezplatform.workflow.action_listener }