Reznor are four dinosaurs that appeared as a miniboss in Super Mario World. They are gray and have a slight appearance of a Triceratops.

Mario and Luigi fought them in their castle in Chocolate Island and defeated them. They stand on four revolving platforms and shoot fireballs at Mario. The logs of the bridges slowly disappear, leaving less room to fight. To defeat them, Mario must hit the platforms they are standing on with his head.

Optional Reznor battles are also in Vanilla Dome, the Forest of Illusion, and the Valley of Bowser.