World 3-4

World 3-4 may refer to:
 * World 3-4 of Super Mario Bros.
 * World 3-4 of Super Mario Bros. 2.
 * World 3-4 of Super Mario Bros. 3.
 * Prince Froggy's Fort, World 3-4 in Super Mario World 2: Yoshi's Island.
 * Bessie Bass's Battleship, World 3-4 in Yoshi's Island DS.
 * World 3-4 in New Super Mario Bros.
 * World 3-4 in New Super Mario Bros. Wii.
 * Damp Dungeon, World 3-4 in Donkey Kong Country Returns.
 * World 3-4 in Super Mario 3D Land.
 * World 3-4 in New Super Mario Bros. 2.
 * Strike Lake, World 3-4 of Paper Mario: Sticker Star.
 * Urchin Shoals, World 3-4 in New Super Mario Bros. U.
 * The Great Geysers, World 3-4 in New Super Luigi U.