diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9d24730..68025ca8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Features
 
 * Add support for PHP 8.4
+* Add the ability to set a default task when calling `castor` without any arguments
 
 ## 0.19.1 (2024-11-04)
 
diff --git a/doc/getting-started/basic-usage.md b/doc/getting-started/basic-usage.md
index cc7fa300..b3f39ba5 100644
--- a/doc/getting-started/basic-usage.md
+++ b/doc/getting-started/basic-usage.md
@@ -103,3 +103,20 @@ function a_very_long_function_name_that_is_very_painful_to_write(): void
 
 > [!TIP]
 > Related example: [foo.php](https://github.com/jolicode/castor/blob/main/examples/foo.php)
+
+## Setting a default task
+
+The `Castor\Attribute\AsTask` attribute allows you to set a default task when 
+calling `castor` without any arguments:
+
+```php
+use Castor\Attribute\AsTask;
+
+use function Castor\io;
+
+#[AsTask(name: 'bar', namespace: 'foo', default: true)]
+function a_very_long_function_name_that_is_very_painful_to_write(): void
+{
+    io()->writeln('Foo bar');
+}
+```
diff --git a/src/Attribute/AsTask.php b/src/Attribute/AsTask.php
index f745fb75..91235ae8 100644
--- a/src/Attribute/AsTask.php
+++ b/src/Attribute/AsTask.php
@@ -17,6 +17,7 @@ public function __construct(
         public array $onSignals = [],
         public string|bool $enabled = true,
         public bool $ignoreValidationErrors = false,
+        public bool $default = false,
     ) {
     }
 }
diff --git a/src/Function/FunctionLoader.php b/src/Function/FunctionLoader.php
index 58036bdb..833bea00 100644
--- a/src/Function/FunctionLoader.php
+++ b/src/Function/FunctionLoader.php
@@ -11,6 +11,7 @@
 use Castor\Descriptor\SymfonyTaskDescriptor;
 use Castor\Descriptor\TaskDescriptor;
 use Castor\Factory\TaskCommandFactory;
+use Psr\Log\LoggerInterface;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
@@ -23,6 +24,7 @@ public function __construct(
         #[Autowire(lazy: true)]
         private readonly Application $application,
         private readonly TaskCommandFactory $taskCommandFactory,
+        private readonly LoggerInterface $logger,
     ) {
     }
 
@@ -64,8 +66,31 @@ public function loadTasks(
         array $taskDescriptors,
         array $symfonyTaskDescriptors,
     ): void {
+        $previousDefault = null;
+
         foreach ($taskDescriptors as $descriptor) {
             $this->application->add($this->taskCommandFactory->createTask($descriptor));
+
+            if ($descriptor->taskAttribute->default) {
+                $taskName = $descriptor->taskAttribute->name;
+
+                if ($descriptor->taskAttribute->namespace) {
+                    $taskName = $descriptor->taskAttribute->namespace . ':' . $taskName;
+                }
+
+                if (null !== $previousDefault) {
+                    $this->logger->warning(
+                        \sprintf(
+                            'Task "%s" is marked as default, but task "%s" is already marked as default',
+                            $taskName,
+                            $previousDefault
+                        )
+                    );
+                }
+
+                $previousDefault = $taskName;
+                $this->application->setDefaultCommand($taskName);
+            }
         }
         foreach ($symfonyTaskDescriptors as $descriptor) {
             $this->application->add(SymfonyTaskCommand::createFromDescriptor($descriptor));