Limaysaurus ("Limay lizard") is a genus represented by a single species of rebbachisaurid sauropod dinosaurs, which lived during the mid-Cretaceous period, about 99.6 to 97 million years ago, in the Cenomanian, in what is now South America (northwestern Patagonia and northeastern Brazil).

[2][3] The holotype specimen, MUCPv-205, a partial skeleton including the back of the skull, was found in 1988 by Lieto Francisco Tessone, who is honoured in the specific name.

[1] Limaysaurus was found 15 km (9 mi) southwest of Villa El Chocón, Picún Leufú Department, Neuquén Province, Patagonia, Argentina.

This discovery supports the theory that there was a land bridge connecting South America to Africa 100 million years ago.

The rebbachisaurids are a basal clade within the Diplodocimorpha, and their remains have been found in Cretaceous-age rocks in Europe, South America, and Africa.