diff --git a/core/Command/Group/AddUser.php b/core/Command/Group/AddUser.php
index b5d0068acc654..141916953abab 100644
--- a/core/Command/Group/AddUser.php
+++ b/core/Command/Group/AddUser.php
@@ -24,8 +24,11 @@
 namespace OC\Core\Command\Group;
 
 use OC\Core\Command\Base;
+use OCP\IGroup;
 use OCP\IGroupManager;
+use OCP\IUser;
 use OCP\IUserManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -75,4 +78,27 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$group->addUser($user);
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'group') {
+			return array_map(static fn (IGroup $group) => $group->getGID(), $this->groupManager->search($context->getCurrentWord()));
+		}
+		if ($argumentName === 'user') {
+			$groupId = $context->getWordAtIndex($context->getWordIndex() - 1);
+			$group = $this->groupManager->get($groupId);
+			if ($group === null) {
+				return [];
+			}
+
+			$members = array_map(static fn (IUser $user) => $user->getUID(), $group->searchUsers($context->getCurrentWord()));
+			$users = array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+			return array_diff($users, $members);
+		}
+		return [];
+	}
 }
diff --git a/core/Command/Group/Delete.php b/core/Command/Group/Delete.php
index be97be83407cc..2596b461d1708 100644
--- a/core/Command/Group/Delete.php
+++ b/core/Command/Group/Delete.php
@@ -27,7 +27,9 @@
 namespace OC\Core\Command\Group;
 
 use OC\Core\Command\Base;
+use OCP\IGroup;
 use OCP\IGroupManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -74,4 +76,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		}
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'groupid') {
+			return array_map(static fn (IGroup $group) => $group->getGID(), $this->groupManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/Group/Info.php b/core/Command/Group/Info.php
index 180055e83ea55..5e9fa6611309f 100644
--- a/core/Command/Group/Info.php
+++ b/core/Command/Group/Info.php
@@ -28,6 +28,7 @@
 use OC\Core\Command\Base;
 use OCP\IGroup;
 use OCP\IGroupManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -79,4 +80,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			return 0;
 		}
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'groupid') {
+			return array_map(static fn (IGroup $group) => $group->getGID(), $this->groupManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/Group/RemoveUser.php b/core/Command/Group/RemoveUser.php
index 4af66480f28cb..2b9c4eaec529b 100644
--- a/core/Command/Group/RemoveUser.php
+++ b/core/Command/Group/RemoveUser.php
@@ -24,8 +24,11 @@
 namespace OC\Core\Command\Group;
 
 use OC\Core\Command\Base;
+use OCP\IGroup;
 use OCP\IGroupManager;
+use OCP\IUser;
 use OCP\IUserManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -75,4 +78,24 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$group->removeUser($user);
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'group') {
+			return array_map(static fn (IGroup $group) => $group->getGID(), $this->groupManager->search($context->getCurrentWord()));
+		}
+		if ($argumentName === 'user') {
+			$groupId = $context->getWordAtIndex($context->getWordIndex() - 1);
+			$group = $this->groupManager->get($groupId);
+			if ($group === null) {
+				return [];
+			}
+			return array_map(static fn (IUser $user) => $user->getUID(), $group->searchUsers($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/Delete.php b/core/Command/User/Delete.php
index 37e09ca69caa8..9624f04fa18f1 100644
--- a/core/Command/User/Delete.php
+++ b/core/Command/User/Delete.php
@@ -24,13 +24,15 @@
  */
 namespace OC\Core\Command\User;
 
+use OC\Core\Command\Base;
+use OCP\IUser;
 use OCP\IUserManager;
-use Symfony\Component\Console\Command\Command;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class Delete extends Command {
+class Delete extends Base {
 	/** @var IUserManager */
 	protected $userManager;
 
@@ -68,4 +70,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$output->writeln('<error>The specified user could not be deleted. Please check the logs.</error>');
 		return 1;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'uid') {
+			return array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/Disable.php b/core/Command/User/Disable.php
index e4f43e26f5903..9120d28cc1f64 100644
--- a/core/Command/User/Disable.php
+++ b/core/Command/User/Disable.php
@@ -23,13 +23,15 @@
  */
 namespace OC\Core\Command\User;
 
+use OC\Core\Command\Base;
+use OCP\IUser;
 use OCP\IUserManager;
-use Symfony\Component\Console\Command\Command;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class Disable extends Command {
+class Disable extends Base {
 	/** @var IUserManager */
 	protected $userManager;
 
@@ -63,4 +65,22 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$output->writeln('<info>The specified user is disabled</info>');
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'uid') {
+			return array_map(
+				static fn (IUser $user) => $user->getUID(),
+				array_filter(
+					$this->userManager->search($context->getCurrentWord()),
+					static fn (IUser $user) => $user->isEnabled()
+				)
+			);
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/Enable.php b/core/Command/User/Enable.php
index 80efec3bc3f8f..eb548a74d7eb4 100644
--- a/core/Command/User/Enable.php
+++ b/core/Command/User/Enable.php
@@ -23,13 +23,15 @@
  */
 namespace OC\Core\Command\User;
 
+use OC\Core\Command\Base;
+use OCP\IUser;
 use OCP\IUserManager;
-use Symfony\Component\Console\Command\Command;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class Enable extends Command {
+class Enable extends Base {
 	/** @var IUserManager */
 	protected $userManager;
 
@@ -63,4 +65,22 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$output->writeln('<info>The specified user is enabled</info>');
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'uid') {
+			return array_map(
+				static fn (IUser $user) => $user->getUID(),
+				array_filter(
+					$this->userManager->search($context->getCurrentWord()),
+					static fn (IUser $user) => !$user->isEnabled()
+				)
+			);
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/Info.php b/core/Command/User/Info.php
index 36bfa0b6d5b1f..a93f65b7dce2d 100644
--- a/core/Command/User/Info.php
+++ b/core/Command/User/Info.php
@@ -28,6 +28,7 @@
 use OCP\IGroupManager;
 use OCP\IUser;
 use OCP\IUserManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -110,4 +111,16 @@ protected function getStorageInfo(IUser $user): array {
 			'quota' => $storage['quota'],
 		];
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'user') {
+			return array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/LastSeen.php b/core/Command/User/LastSeen.php
index e56ddd5087f2f..dc01ca549f3a4 100644
--- a/core/Command/User/LastSeen.php
+++ b/core/Command/User/LastSeen.php
@@ -25,13 +25,15 @@
  */
 namespace OC\Core\Command\User;
 
+use OC\Core\Command\Base;
+use OCP\IUser;
 use OCP\IUserManager;
-use Symfony\Component\Console\Command\Command;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class LastSeen extends Command {
+class LastSeen extends Base {
 	/** @var IUserManager */
 	protected $userManager;
 
@@ -73,4 +75,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		}
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'uid') {
+			return array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/ResetPassword.php b/core/Command/User/ResetPassword.php
index 798f5dad58581..174a9f4068d0f 100644
--- a/core/Command/User/ResetPassword.php
+++ b/core/Command/User/ResetPassword.php
@@ -27,8 +27,10 @@
  */
 namespace OC\Core\Command\User;
 
+use OC\Core\Command\Base;
+use OCP\IUser;
 use OCP\IUserManager;
-use Symfony\Component\Console\Command\Command;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
@@ -37,7 +39,7 @@
 use Symfony\Component\Console\Question\ConfirmationQuestion;
 use Symfony\Component\Console\Question\Question;
 
-class ResetPassword extends Command {
+class ResetPassword extends Base {
 
 	/** @var IUserManager */
 	protected $userManager;
@@ -133,4 +135,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		}
 		return 0;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'user') {
+			return array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+		}
+		return [];
+	}
 }
diff --git a/core/Command/User/Setting.php b/core/Command/User/Setting.php
index 87fb6905de96f..3e4830127cd08 100644
--- a/core/Command/User/Setting.php
+++ b/core/Command/User/Setting.php
@@ -29,6 +29,7 @@
 use OCP\IConfig;
 use OCP\IUser;
 use OCP\IUserManager;
+use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -255,4 +256,27 @@ protected function getUserSettings($uid, $app) {
 
 		return $settings;
 	}
+
+	/**
+	 * @param string $argumentName
+	 * @param CompletionContext $context
+	 * @return string[]
+	 */
+	public function completeArgumentValues($argumentName, CompletionContext $context) {
+		if ($argumentName === 'uid') {
+			return array_map(static fn (IUser $user) => $user->getUID(), $this->userManager->search($context->getCurrentWord()));
+		}
+		if ($argumentName === 'app') {
+			$userId = $context->getWordAtIndex($context->getWordIndex() - 1);
+			$settings = $this->getUserSettings($userId, '');
+			return array_keys($settings);
+		}
+		if ($argumentName === 'key') {
+			$userId = $context->getWordAtIndex($context->getWordIndex() - 2);
+			$app = $context->getWordAtIndex($context->getWordIndex() - 1);
+			$settings = $this->getUserSettings($userId, $app);
+			return array_keys($settings[$app]);
+		}
+		return [];
+	}
 }