Altirhinus (meaning "High Snout") is a genus of iguanodontid from Early Cretaceous of Mongolia. It was first known as Iguanodon orientalis, but later recongnized as a new genus. It's name changed to A. kurzanovi. In 2010, Gregory S. Paul estimated the length of Altirhinus at 6.5 metres. All known specimens of Altirhinus were recovered in 1981 during collaborative expeditions organized by Soviet and Mongolian scientists.