diff --git a/Command/ChillImportUsersCommand.php b/Command/ChillImportUsersCommand.php
new file mode 100644
index 000000000..db05cc250
--- /dev/null
+++ b/Command/ChillImportUsersCommand.php
@@ -0,0 +1,403 @@
+<?php
+
+namespace Chill\MainBundle\Command;
+
+use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use League\Csv\Reader;
+use Doctrine\ORM\EntityManagerInterface;
+use Chill\MainBundle\Entity\Center;
+use Symfony\Component\Console\Question\ConfirmationQuestion;
+use Chill\MainBundle\Entity\User;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
+use Symfony\Component\Validator\ConstraintViolationListInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
+use Chill\MainBundle\Entity\GroupCenter;
+use Chill\MainBundle\Entity\PermissionsGroup;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+class ChillImportUsersCommand extends ContainerAwareCommand
+{
+    
+    /**
+     *
+     * @var EntityManagerInterface
+     */
+    protected $em;
+    
+    /**
+     *
+     * @var ValidatorInterface
+     */
+    protected $validator;
+    
+    /**
+     *
+     * @var LoggerInterface
+     */
+    protected $logger;
+    
+    /**
+     *
+     * @var UserPasswordEncoderInterface
+     */
+    protected $passwordEncoder;
+    
+    /**
+     *
+     * @var \Chill\MainBundle\Repository\UserRepository
+     */
+    protected $userRepository;
+    
+    /**
+     *
+     * @var bool
+     */
+    protected $doChanges = true;
+    
+    /**
+     *
+     * @var OutputInterface
+     */
+    protected $tempOutput;
+    
+    /**
+     *
+     * @var InputInterface
+     */
+    protected $tempInput;
+    
+    /**
+     * Centers and aliases.
+     * 
+     * key are aliases, values are an array of centers
+     *
+     * @var array
+     */
+    protected $centers = [];
+    
+    /**
+     * 
+     * @var array
+     */
+    protected $permissionGroups = [];
+    
+    /**
+     *
+     * @var array
+     */
+    protected $groupCenters = [];
+    
+    public function __construct(
+        EntityManagerInterface $em,
+        LoggerInterface $logger,
+        UserPasswordEncoderInterface $passwordEncoder,
+        ValidatorInterface $validator
+    ) {
+        $this->em = $em;
+        $this->passwordEncoder = $passwordEncoder;
+        $this->validator = $validator;
+        $this->logger = $logger;
+        
+        
+        $this->userRepository = $em->getRepository(User::class);
+        
+        parent::__construct('chill:main:import-users');
+    }
+
+    
+    
+    protected function configure()
+    {
+        $this
+            ->setDescription('Import users from csv file')
+            ->setHelp("Import users from a csv file. Users are added to centers contained in the file. Headers are used to detect columns. Adding to multiple centers can be done by using a `grouping centers` file, which will group multiple centers into a signle alias, used in 'centers' column.")
+            ->addArgument('csvfile', InputArgument::REQUIRED, 'Path to the csv file. Columns are: `username`, `email`, `center` (can contain alias), `permission group`')
+            ->addOption('grouping-centers', null, InputOption::VALUE_OPTIONAL, 'Path to a csv file to aggregate multiple centers into a single alias')
+            ->addOption('dry-run', null, InputOption::VALUE_OPTIONAL, 'Do not commit the changes')
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->tempOutput = $output;
+        $this->tempInput = $input;
+        
+        if ($input->hasOption('dry-run')) {
+            $this->doChanges = false;
+        }
+        
+        if ($input->hasOption('grouping-centers')) {
+            $this->prepareGroupingCenters();
+        }
+        
+        $this->loadUsers();
+    }
+    
+    protected function loadUsers()
+    {
+        $reader = Reader::createFromPath($this->tempInput->getArgument('csvfile'));
+        $reader->setHeaderOffset(0);
+        
+        foreach ($reader->getRecords() as $line => $r) {
+            $this->logger->debug("starting handling new line", [
+                'line' => $line
+            ]);
+            
+            if ($this->doesUserExists($r)) {
+                $this->tempOutput->writeln(sprintf("User with username '%s' already "
+                    . "exists, skipping"));
+                
+                $this->logger->info("One user already exists, skipping creation", [
+                    'username_in_file' => $r['username'],
+                    'email_in_file' => $r['email'],
+                    'line' => $line
+                ]);
+                
+                continue;
+            }
+            
+            $this->createUser($line, $r);
+        }
+    }
+    
+    protected function doesUserExists($data)
+    {
+        if ($this->userRepository->countByUsernameOrEmail($data['username']) > 0) {
+            return true;
+        }
+
+        if ($this->userRepository->countByUsernameOrEmail($data['email']) > 0) {
+            return true;
+        }
+        
+        return false;
+    }
+    
+    protected function createUser($offset, $data)
+    {
+        $user = new User();
+        $user
+            ->setEmail($data['email'])
+            ->setUsername($data['username'])
+            ->setEnabled(true)
+            ->setPassword($this->passwordEncoder->encodePassword($user, 
+                \bin2hex(\random_bytes(32))))
+            ;
+        
+        $errors = $this->validator->validate($user);
+        
+        if ($errors->count() > 0) {
+            $errorMessages = $this->concatenateViolations($errors);
+            
+            $this->tempOutput->writeln(sprintf("%d errors found with user with username \"%s\" at line %d", $errors->count(), $data['username'], $offset));
+            $this->tempOutput->writeln($errorMessages);
+
+            throw new \RuntimeException("Found errors while creating an user. "
+                . "Watch messages in command output");
+        }
+        
+        $pgs = $this->getPermissionGroup($data['permission group']);
+        $centers = $this->getCenters($data['center']);
+        
+        foreach($pgs as $pg) {
+            foreach ($centers as $center) {
+                $user->addGroupCenter($this->createOrGetGroupCenter($center, $pg));
+            }
+        }
+        
+
+        if ($this->doChanges) {
+            $this->em->persist($user);
+            $this->flush();
+        }
+                        
+        $this->logger->notice("Create user", [
+            'username' => $user->getUsername(),
+            'id' => $user->getId(),
+            'nb_of_groupCenters' => $user->getGroupCenters()->count()
+        ]);
+
+    }
+    
+    protected function getPermissionGroup($alias)
+    {
+        if (\array_key_exists($alias, $this->permissionGroups)) {
+            return $this->permissionGroups[$alias];
+        }
+        
+        $permissionGroupsByName = [];
+        
+        foreach($this->em->getRepository(PermissionsGroup::class)
+            ->findAll() as $permissionGroup) {
+            $permissionGroupsByName[$permissionGroup->getName()] = $permissionGroup;
+        }
+        
+        if (count($permissionGroupsByName) === 0) {
+            throw new \RuntimeException("no permission groups found. Create them "
+                . "before importing users");
+        }
+        
+        $question = new ChoiceQuestion("To which permission groups associate with \"$alias\" ?", 
+            \array_keys($permissionGroupsByName));
+        $question
+            ->setMultiselect(true)
+            ->setAutocompleterValues(\array_keys($permissionGroupsByName))
+            ->setNormalizer(function($value) {
+                if (NULL === $value) { return ''; }
+                
+                return \trim($value);
+            })
+            ;
+        $helper = $this->getHelper('question');
+        
+        $keys = $helper->ask($this->tempInput, $this->tempOutput, $question);
+        
+        $this->tempOutput->writeln("You have chosen ".\implode(", ", $keys));
+        
+        if ($helper->ask($this->tempInput, $this->tempOutput, 
+            new ConfirmationQuestion("Are you sure ?", true))) {
+            
+            foreach ($keys as $key) {
+                $this->permissionGroups[$alias][] = $permissionGroupsByName[$key];
+            }
+            
+            return $this->permissionGroups[$alias];
+        } else {
+            $this->logger->error("Error while responding to a a question");
+            
+            $this->tempOutput("Ok, I accept, but I do not know what to do. Please try again.");
+            
+            throw new \RuntimeException("Error while responding to a question");
+        }
+    }
+    
+    /**
+     * 
+     * @param Center $center
+     * @param \Chill\MainBundle\Command\PermissionGroup $pg
+     * @return GroupCenter
+     */
+    protected function createOrGetGroupCenter(Center $center, PermissionsGroup $pg): GroupCenter
+    {
+        if (\array_key_exists($center->getId(), $this->groupCenters)) {
+            if (\array_key_exists($pg->getId(), $this->groupCenters[$center->getId()])) {
+                return $this->groupCenters[$center->getId()][$pg->getId()];
+            }
+        }
+        
+        $repository = $this->em->getRepository(GroupCenter::class);
+        
+        $groupCenter = $repository->findOneBy(array(
+                'center' => $center,
+                'permissionsGroup' => $pg
+            ));
+        
+        if ($groupCenter === NULL) {
+            $groupCenter = new GroupCenter();
+            $groupCenter
+                ->setCenter($center)
+                ->setPermissionsGroup($pg)
+                ;
+            
+            $this->em->persist($groupCenter);
+        }
+        
+        $this->groupCenters[$center->getId()][$pg->getId()] = $groupCenter;
+        
+        return $groupCenter;
+    }
+    
+    protected function prepareGroupingCenters()
+    {
+        $reader = Reader::createFromPath($this->tempInput->getOption('grouping-centers'));
+        $reader->setHeaderOffset(0);
+        
+        foreach ($reader->getRecords() as $r) {
+            $this->centers[$r['alias']] = 
+                \array_merge(
+                    $this->centers[$r['alias']] ?? [],
+                    $this->getCenters($r['center']
+                    )
+                );
+        }
+    }
+    
+    /**
+     * return a list of centers matching the name of alias.
+     * 
+     * If the name match one center, this center is returned in an array.
+     * 
+     * If the name match an alias, the centers corresponding to the alias are 
+     * returned in an array.
+     * 
+     * If the center is not found or alias is not created, a new center is created
+     * and suggested to user
+     * 
+     * @param string $name the name of the center or the alias regrouping center
+     * @return Center[]
+     */
+    protected function getCenters($name)
+    {
+        if (\array_key_exists($name, $this->centers)) {
+            return $this->centers[$name];
+        }
+        
+        // search for a center with given name
+        $center = $this->em->getRepository(Center::class)
+            ->findOneByName($name);
+        
+        if ($center instanceof Center) {
+            $this->centers[$name] = [$center];
+            
+            return $this->centers[$name];
+        }
+        
+        // suggest and create
+        $center = (new Center())
+            ->setName($name);
+        
+        $this->tempOutput->writeln("Center with name \"$name\" not found.");
+        $qFormatter = $this->getHelper('question');
+        $question = new ConfirmationQuestion("Create a center with name \"$name\" ?", true);
+        
+        if ($qFormatter->ask($this->tempInput, $this->tempOutput, $question)) {
+            $this->centers[$name] = [ $center ];
+            
+            $errors = $this->validator->validate($center);
+            
+            if ($errors->count() > 0) {
+                $errorMessages = $this->concatenateViolations($errors);
+                
+                $this->tempOutput->writeln(sprintf("%d errors found with center with name \"%s\"", $errors->count(), $name));
+                $this->tempOutput->writeln($errorMessages);
+                
+                throw new \RuntimeException("Found errors while creating one center. "
+                    . "Watch messages in command output");
+            }
+            
+            $this->em->persist($center);
+            
+            return $this->centers[$name];
+        }
+        
+        return null;
+    }
+    
+    protected function concatenateViolations(ConstraintViolationListInterface $list)
+    {
+        $str = [];
+        
+        foreach ($list as $e) {
+            /* @var $e \Symfony\Component\Validator\ConstraintViolationInterface */
+            $str[] = $e->getMessage();
+        }
+        
+        return \implode(";", $str);
+    }
+    
+}
diff --git a/DependencyInjection/ChillMainExtension.php b/DependencyInjection/ChillMainExtension.php
index 5cae303de..be61a3d49 100644
--- a/DependencyInjection/ChillMainExtension.php
+++ b/DependencyInjection/ChillMainExtension.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright (C) 2014-2016 Julien Fastré <julien.fastre@champs-libres.coop>
+ * Copyright (C) 2014-2018 Julien Fastré <julien.fastre@champs-libres.coop>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -108,6 +108,7 @@ class ChillMainExtension extends Extension implements PrependExtensionInterface,
         $loader->load('services/security.yml');
         $loader->load('services/notification.yml');
         $loader->load('services/redis.yml');
+        $loader->load('services/command.yml');
     }
     
     public function getConfiguration(array $config, ContainerBuilder $container)
diff --git a/Entity/User.php b/Entity/User.php
index c814d7a01..b483cb906 100644
--- a/Entity/User.php
+++ b/Entity/User.php
@@ -229,6 +229,8 @@ class User implements AdvancedUserInterface {
     public function setEnabled($enabled)
     {
         $this->enabled = $enabled;
+        
+        return $this;
     }
     
     /**
diff --git a/Repository/UserRepository.php b/Repository/UserRepository.php
new file mode 100644
index 000000000..ca7053351
--- /dev/null
+++ b/Repository/UserRepository.php
@@ -0,0 +1,67 @@
+<?php
+/*
+ * Copyright (C) 2018 Julien Fastré <julien.fastre@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+namespace Chill\MainBundle\Repository;
+
+/**
+ * 
+ *
+ */
+class UserRepository extends \Doctrine\ORM\EntityRepository
+{
+    public function countByUsernameOrEmail($pattern)
+    {
+        $qb = $this->queryByUsernameOrEmail($pattern);
+        
+        $qb->select('COUNT(u)');
+        
+        return (int) $qb->getQuery()->getSingleScalarResult();
+    }
+    
+    public function findByUsernameOrEmail($pattern) 
+    {
+        $qb = $this->queryByUsernameOrEmail($pattern);
+        
+        return $qb->getQuery()->getResult();
+    }
+    
+    public function findOneByUsernameOrEmail($pattern)
+    {
+        $qb = $this->queryByUsernameOrEmail($pattern);
+        
+        return $qb->getQuery()->getSingleResult();
+    }
+    
+    protected function queryByUsernameOrEmail($pattern)
+    {
+        $qb = $this->createQueryBuilder('u');
+        
+        $searchByPattern = $qb->expr()->orX();
+        
+        $searchByPattern
+            ->add($qb->expr()->eq('u.usernameCanonical', 'LOWER(UNACCENT(:pattern))'))
+            ->add($qb->expr()->eq('u.emailCanonical', 'LOWER(UNACCENT(:pattern))'))
+            ;
+        
+        $qb
+            ->where($searchByPattern)
+            ->setParameter('pattern', $pattern)
+            ;
+        
+        return $qb;
+    }
+}
diff --git a/Resources/config/doctrine/User.orm.yml b/Resources/config/doctrine/User.orm.yml
index 08d8064d3..ad1398d3d 100644
--- a/Resources/config/doctrine/User.orm.yml
+++ b/Resources/config/doctrine/User.orm.yml
@@ -1,6 +1,7 @@
 Chill\MainBundle\Entity\User:
     type: entity
     table: users
+    repositoryClass: Chill\MainBundle\Repository\UserRepository
     cache:
         usage: NONSTRICT_READ_WRITE
         region: acl_cache_region
diff --git a/Resources/config/services/command.yml b/Resources/config/services/command.yml
new file mode 100644
index 000000000..51065922f
--- /dev/null
+++ b/Resources/config/services/command.yml
@@ -0,0 +1,10 @@
+services:
+    Chill\MainBundle\Command\ChillImportUsersCommand:
+        arguments:
+            $em: '@Doctrine\ORM\EntityManagerInterface'
+            $logger: '@Psr\Log\LoggerInterface'
+            $passwordEncoder: '@Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface'
+            $validator: '@Symfony\Component\Validator\Validator\ValidatorInterface'
+            
+        tags:
+            - { name: console.command }