World 3-1

World 3-1 may refer to:
 * World 3-1 (Super Mario Bros.)
 * World 3-1 (Super Mario Bros.: The Lost Levels)
 * World 3-1 (Super Mario Bros. 2)
 * World 3-1 (Super Mario Bros. 3)
 * Welcome to Monkey World!, World 3-1 in Super Mario World 2: Yoshi's Island.
 * Up the Creek, World 3-1 in Yoshi's Island DS.
 * World 3-1 (New Super Mario Bros.)
 * World 3-1 (New Super Mario Bros. Wii)
 * World 3-1 (Super Mario 3D Land)
 * World 3-1 (New Super Mario Bros. 2)
 * Waterspout Beach, World 3-1 in New Super Mario Bros. U.
 * Huckit Beach Resort, World 3-1 in New Super Luigi U.