Rhoetosaurus (meaning "Rhoetos lizard"), named after Rhoetus, a titan in Greek mythology, is a genus of sauropod dinosaur from the Jurassic (Oxfordian)[1] Walloon Coal Measures of what is now eastern Australia.

The station manager, Arthur Browne, forwarded fragments of bone to Longman, and was honoured with the dinosaur's specific name brownei.

By 2012, prepared material comprised 40 vertebrae, five partial thoracic ribs, part of the sacrum, fragments of the ilia, an ischium, the left and right pubic bones, and much of the right hind limb (femur, tibia, fibula, astragalus, and pes).

Initially Longman, with advice from leading German paleontologist Friedrich von Huene, noted the primitive nature of Rhoetosaurus, and so for a long time, it was called a cetiosaurid.

The form of the nearly complete hind foot ([1])at least suggests that lies outside the more derived Neosauropoda, but the material needs further study to determine its precise positioning in sauropod evolution.