Tastavinsaurus is a genus of sauropod dinosaur belonging to the Titanosauriformes.

It is based on a partial skeleton from the Early Cretaceous Xert Formation of Spain.

The type species is Tastavinsaurus sanzi, named in honor of the Rio Tastavins in Spain and Spanish paleontologist José Luis Sanz.

[3] The clade Laurasiformes was coined for Tastavinsaurus and its close relatives, which may include Cedarosaurus, Soriatitan, and Venenosaurus.

[4] The caudal vertebrae are similar to those of other basal titanosauriforms, such as Cedarosaurus.