Lavocatisaurus (meaning "René Lavocat's lizard") is a genus of sauropod in the family Rebbachisauridae from the Early Cretaceous (Aptian to Albian) Rayoso Formation of the Neuquén Basin, northern Patagonia, Argentina.

[1] In 2009, a group of Spanish–Argentinean palaeontologists attempted to locate the site from which the holotype of the rebbachisaurid Rayososaurus agrioensis was discovered.

While investigating strata belonging to the Pichi Neuquén Member of the Rayoso Formation, the remains of a different rebbachisaurid taxon, consisting of two juveniles and an adult, were uncovered.

The skull is well preserved for the most part, and it provides further evidence that some sauropods may have had a beak-like keratinous sheath covering the anterior of the snout.

They resolved it in a derived position relative to other basal rebbachisaurids, as the sister group to the Khebbashia, the clade formed by Rebbachisaurinae and Limaysaurinae.