Notocolossus is a genus of titanosaurian sauropod dinosaur from late Cretaceous strata of Mendoza Province, Argentina.

A fossil of a large sauropod was discovered by the Argentine paleontologist Dr. Bernardo Javier González Riga in Mendoza province.

[1] In 2016, the type species Notocolossus gonzalezparejasi was named and described by Bernardo Javier González Riga, Matthew Carl Lamanna, Leonardo Daniel Ortiz David, Jorge Orlando Calvo and Juan P. Coria.

The generic name combines the Greek words νότος, notos, "south wind", and κολοσσός, kolossos, "giant statue", in reference to the provenance from the Southern Hemisphere and the gigantic size of the animal.

The specific name honours Jorge González Parejas, for having studied the dinosaur fossils of Mendoza province for two decades.

Although the bones have not been discovered in articulation, they were considered to represent a single individual because they were found in close association on a surface of eight by eight metres.

A second partial skeleton lacking the skull was referred to Notocolossus: specimen UNCUYO-LD 302 representing a smaller individual.

[1][6] This formation is about 25 metres (82 ft) thick and composed of light red claystones and thin bands of pink sandstone.

[7] These titanosaurs, in addition to Notocolossus, include Petrobrasaurus,[8] "Antarctosaurus"[9][6] and a specimen that appears to be an oldest member of the group Aeolosaurini.