You can use  the [Automatic Nodetitles][1] module.

> "auto_nodetitle" is a small and efficient module that allows hiding of the content title field in the form. To prevent empty content title fields one can configure it to generate the title by a given pattern.

If you want to hide the title for the particular node or content type, then you should use [hook_form_alter()][2].




  [1]: http://drupal.org/project/auto_nodetitle
  [2]: http://api.drupal.org/api/drupal/modules!system!system.api.php/function/hook_form_alter/7