World 9

World 9 (also written as World Nine) can refer to:


 * World 9 (Super Mario Bros.: The Lost Levels) - World 9 of Super Mario Bros.: The Lost Levels.
 * Warp Zone - World 9 and the final World of Super Mario Bros. 3.
 * Tower - World 9 and the final World of Donkey Kong on Game Boy.
 * World 9 (New Super Mario Bros. Wii) - World 9 and the special World of New Super Mario Bros. Wii.
 * Golden Temple - World 9 and the final World of Donkey Kong Country Returns.
 * Superstar Road - World 9 and the final World of New Super Mario Bros. U.