Kritosaurus (KRIT-oh-SORE-us) is a doubtful genus; this fossils may actually be Gryposaurus, but may be a separate genus. It was a duck-billed dinosaur from the late Cretaceous period, about 76 to 65 million years ago. This hadrosaurid was a plant-eater that was about 30 feet (9 metres) long.

It had a flat head and a big bump on its snout. It is known from a fragmentary skull found in the San Juan basin of New Mexico, USA. Kritosaurus was named by fossil hunter Barnum Brown in 1910. The type species is K. navajovius (known from a poorly-preserved skull).