Saturnalia is an extinct genus of basal sauropodomorph dinosaur known from the Late Triassic Santa Maria Formation of Rio Grande do Sul, southern Brazil.

Fossils of Saturnalia were first collected by the Museum of Science and Technology of the Pontifical Catholic University of Rio Grande do Sul in the austral summer of 1998.

[3] In 1999, Max Cardoso Langer, Fernando Abdala, Martha Richter, and Michael J. Benton described the new genus and species Saturnalia tupiniquim based on the three skeletons.

The holotype, MCP 3844-PV is a partial skeleton including most of the presacral vertebrae and sacrum, the pectoral and pelvic girdles, the right humerus and part of the right ulna, the left femur, and most of the right hind limb.

[5] The known fossils of Saturnalia all come from a single site in the Alemoa Member of the Santa Maria Formation, and are included in the Hyperodapedon Assemblage Zone.

[b][10] The primitive nature of Saturnalia, combined with its mixture of sauropodomorph and theropod characteristics, has made it difficult to classify.

[16] Like many other early dinosaurs, but unlike later sauropodomorphs, Saturnalia was most likely carnivorous or omnivorous, with a diet that included insects or small vertebrates.