| Named By: | M. G. Mehl in 1913 |
| Time Period: | Late Triassic |
| Location: | USA, Arizona - Chinle Formation, New Mexico - Santa Rosa Formation, Texas - Colorado City Formation and Wyoming - Popo Agie Formation. Possibly Morocco |
| Size: | Skull of A. grandis about 120 centimetres long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Several individuals mostly known from skulls, but some post cranial remains also known |
| Classification: | | Chordata | Phytosauria | Phytosauridae | |
Angistorhinus (meaning "narrow snout" or "hook snout") is an extinct genus of phytosaur known from the Late Triassic period of Texas and Wyoming, United States. It was first named by Mehl in 1913 and the type species is Angistorhinus grandis. Other species from Texas and Wyoming, A. alticephalus (Stovall and Wharton, 1936), A. gracilis (Mehl, 1915) and A. maximus (Mehl, 1928), are cospecific with the type species. Angistorhinus is known from the holotype UC 631, partial skull and lower jaws recovered from the Popo Agie Formation, Chugwater Group, Wyoming and from the associated paratype UM 531, a partial skull, TMM 31098-1, skull and lower jaws and ROM 7977, partial skull and lower jaws, recovered from the 'Pre-Tecovas Horizon' in the Dockum Group, Texas. A possible second species, A. talainti is known from the Triassic of Morocco. In 1995, Long and Murry created the new combination, Angistorhinus megalodon by synonymy for Brachysuchus. Hungerbuhler and Sues (2001) hypothesised that Angistorhinus is a junior synonym of Rutiodon. However, in 2010 Michelle R. Stocker retained the validity of Brachysuchus and of A. grandis.