Nool

Nool may refer to:
 * Nool - a Social Media app for personal growth and conversations within goal-based communities
 * NOOL - An online library offering multi-lingual books
 * Nool or Hydron, an enemy character from Red Earth
 * Jungle of Nool, a fictional place in Horton Hears a Who!

People with the surname

 * Erki Nool, decathlon gold medalist