Dravidosaurus (meaning "Dravidanadu lizard", Dravidanadu being a region in the southern part of India where the remains were discovered) is an extinct genus of prehistoric reptile which is thought to be the last surviving stegosaur, the group of "plated" dinosaurs. With an estimated length of 3 metres (10 ft), it would have also been the smallest member of the group. More recent studies, however, have shown that the bones actually belonged to a plesiosaurian marine reptile. However, later still, It's Stegosaurian Identity was reaffirmed.
Dravidosaurus lived in the Late Cretaceous period (Coniacian stage) of what is now India. It is only known from a poorly preserved skeleton containing a partial skull, a tooth and plates. The badly weathered remains were discovered in marine deposits near Ariyalur in the state of Tamil Nadu in South India. During the 1990s, further study indicated it was a plesiosaur and not a dinosaur. However, later researchers stated that Dravidosaurus was likely Stegosaurian, due to the presence of plates and spikes in the material. One of the original authors has stated that more remains from the type locality are currently under study.