World 6-5

World 6-5 may refer to:
 * World 6-5 (Super Mario Bros. 3)
 * The Very Loooooong Cave, World 6-5 in Super Mario World 2: Yoshi's Island.
 * World 6-5 (New Super Mario Bros.)
 * World 6-5 (New Super Mario Bros. Wii)
 * World 6-5 (Super Mario 3D Land)
 * World 6-5 (New Super Mario Bros. 2)
 * Walking Piranha Plants!, World 6-5 in New Super Mario Bros. U.
 * Rising Piranhas, World 6-5 in New Super Luigi U.