Irritator (name meaning "irritating") is a genus of spinosaurid theropod dinosaur that lived in South America during the Early Cretaceous period.
A smaller relative of Spinosaurus, Irritator measured about 8 metres in length. It is known from a partial skull, which had been modified by the fossil traders who illegally sold it. The name Irritator comes from the frustrating task of restoring it that had to be done. This genus may be synonymous with the closley-related spinosaur Angaturama, which was found in the same locality as Irritator.
Irritator was seen in a database scene with Baryonyx, Siamosaurus and Spinosaurus as an example of a spinosaur from South America; and how the spinosaurids were more diverse and generalist eaters rather than sustaining just on fish.