World 2-1

World 2-1 may refer to:
*The first level in the second world in Super Mario Bros.
*The first level in the second world in Super Mario Bros.: The Lost Levels
*The first level in the second world in Super Mario Bros. 2
*The first level in the second world in Super Mario Bros. 3
*The level in Super Mario Land
*The first level in the second world in New Super Mario Bros.
*The first level in the second world in New Super Mario Bros. Wii
*The first level in the second world in Super Mario 3D Land
*The first level in the second world in New Super Mario Bros. 2
*The first level in the second world in Puzzle & Dragons: Super Mario Bros. Edition
*A level in Mario Party: Star Rush
*A level in Super Mario Maker for Nintendo 3DS