World 3-1

World 3-1 may refer to:
 * World 3-1 in Super Mario Bros..
 * World 3-1 in Super Mario Bros.: The Lost Levels.
 * World 3-1 in Super Mario Bros. 2.
 * World 3-1 in Super Mario Bros. 3.
 * Vanilla Dome 1, World 3-1 in Super Mario World.
 * Welcome To Monkey World!, World 3-1 in Super Mario World 2: Yoshi's Island.
 * World 3-1 in New Super Mario Bros..
 * Up the Creek, World 3-1 in Yoshi's Island DS.
 * World 3-1 in New Super Mario Bros. Wii.
 * World 3-1 in Super Mario 3D Land.
 * World 3-1 in New Super Mario Bros. 2.
 * Leaflitter Path, in Paper Mario: Sticker Star.
 * Waterspout Beach, World 3-1 in New Super Mario Bros. U.
 * Huckit Beach Resort, World 3-1 in New Super Luigi U.
 * Snowball Park, World 3-1 in Super Mario 3D World.
 * Rise of the Nasty Nep-Enuts, World 3-1 in Yoshi's New Island.
 * World 3-1 in Puzzle & Dragons: Super Mario Bros. Edition.
 * Pipeline to the Other Side, World 3-1 in Super Mario Maker.
 * Yoshi and Cookies, World 3-1 in Yoshi's Woolly World.
 * World 3-1 in Mario Party: Star Rush.
 * Big Spiny Blitz, World 3-1 in Super Mario Run.