World 6-3

World 6-3 may refer to:
 * World 6-3 (Super Mario Bros.)
 * World 6-3 (Super Mario Bros.: The Lost Levels)
 * World 6-3 (Super Mario Bros. 2)
 * World 6-3 (Super Mario Bros. 3)
 * Beware the Spinning Logs, World 6-3 in Super Mario World 2: Yoshi's Island.
 * World 6-3 (New Super Mario Bros.)
 * World 6-3 (New Super Mario Bros. Wii)
 * World 6-3 (Super Mario 3D Land)
 * World 6-3 (New Super Mario Bros. 2)
 * Waddlewing's Nest, World 6-3 in New Super Mario Bros. U.
 * Spike's Seesaws, World 6-3 in New Super Luigi U.