World 9-1

World 9-1 may refer to:
 * World 9-1 (Super Mario Bros.: The Lost Levels)
 * World 9-1 (New Super Mario Bros. Wii)
 * Spine-Tingling Spine Coaster, World 9-1 of New Super Mario Bros. U.
 * Spine Coaster Connections, World 9-1 of New Super Luigi U.