Panamericansaurus (meaning "Pan American Energy lizard") is a genus of titanosaurian sauropod dinosaur from the Late Cretaceous Period of Argentina.

The holotype is very similar to known fossil material of Aeolosaurus, which Panamericansaurus is thought to be closely related to.

The type species Panamericansaurus schroederi was named and described by Jorge Orlando Calvo and Juan Domingo Porfiri in 2010.

The generic name refers to the Pan American Energy company which financially supported the paleontological investigations.

The holotype, MUCPv-417, was found in June 2003 in a layer of the Allen Formation (Campanian-Maastrichtian) near San Patricio del Chañar, in Neuquén, Argentina.