World 6-8

World 6-8 may refer to:
 * World 6-8 in Super Mario Bros. 3.
 * King Bowser's Castle, World 6-8 in Super Mario World 2: Yoshi's Island.
 * Baby Bowser's Castle Break-In, World 6-8 in Yoshi's New Island.
 * Make Way for King Bowser!, an extension of World 6-8 in Yoshi's New Island.
 * World 6-8 in Puzzle & Dragons: Super Mario Bros. Edition.
 * King Bowser's Castle, World 6-8 in Yoshi's Woolly World.