World 5-1

World 5-1 may refer to:
 * The first stage in the fifth world in Super Mario Bros.
 * The first stage in the fifth world in Super Mario Bros. 3
 * The first stage in the fifth world in New Super Mario Bros.
 * The first stage in the fifth world in New Super Mario Bros. Wii
 * The first stage in the fifth world in Super Mario 3D Land
 * The first stage in the fifth world in Puzzle & Dragons: Super Mario Bros. Edition