Amargatitanis (meaning "Amarga giant") is a genus of titanosaur sauropod dinosaur (a type of large, long-necked quadrupedal herbivorous dinosaur) from the Barremian-age (Lower Cretaceous) La Amarga Formation of Neuquén, Argentina. It is based on specimens MACN PV N51, 53, and 34, which were collected in 1983 and consist of six tail vertebrae, a shoulder blade, a thighbone, and an astragalus, found associated. Among other details, it had a relatively robust, wide, flat shoulder blade.