Aerosteon is a genus of megaraptoran dinosaur from the Late Cretaceous period of Argentina. Its remains were discovered in 1996 in the Anacleto Formation, dating to the Santonian stage (about 84 million years ago). The type and only known species is A. riocoloradense. Its specific name indicates that its remains were found 1 km north of the Río Colorado, in Mendoza Province, Argentina. They show evidence of a bird-like respiratory system.