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Megaraptor ("giant thief") was once thought to be the largest dromaeosaur ever found, but is now known to be a carnosaur related to Allosaurus. It lived in Late Cretaceous times in the Patagonian region of Argentina. It was a contemporary of Giganotosaurus, one of the largest carnivorous dinosaurs of all time.

Megaraptor was initially described as a giant dromaeosaur (the "raptors"), known primarily from a single claw that resembled the sickle-shaped foot claw of dromaeosaurids. The discovery of a complete front limb, however, showed that this giant claw actually came from the first finger of a carnosaur's hand. The hand is still quite different from other carnosaurs, so it may represent an entirely new kind of dinosaur.

Most scientists believe Megaraptor grew to about 26 feet long and 10 feet high.