Siamotyrannus (meaning "Siamese Tyrant") is a genus of carnosaur from the Early Cretaceous. Its fossils, the pelvis and vertebrae were found in Thailand. As evidenced by its name, it was originally thought to be a tyrannosauroid, though it is quite small at 6.5 meters in length (21 ft). It has also been suggested that it may be an allosaurid or sinraptorid.