| Named By: | Dale Russel & Dong Zhiming in 1994 |
| Time Period: | Early Cretaceous, 112-100 Ma |
| Location: | Mongolia - Bayin-Gobi Formation |
| Size: | About 3.8 meters long |
| Diet: | Herbivore |
| Fossil(s): | 5 individuals of varying levels of completeness |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Therizinosauroidea | Alxasauridae | |
Alxasaurus ("Alxa Desert lizard") is a genus of therizinosauroid alxasaurid theropod dinosaur from the Early Cretaceous Period of Inner Mongolia. It is one of the earliest known members of the superfamily Therizinosauroidea, but it already possessed the body shape - including the long neck, short tail, and long hand claws - of later therizinosauroids. Like other members of this group, it was a bipedal herbivore with a large gut to process plant material. Several specimens are known and the largest was a little over 3.8 metres (12 feet) long. According to Gregory S. Paul, it was 4 metres (13 feet) long and its weight was about 400 kilograms (880 pounds).