Qantassaurus (/ˌkwɑːntəˈsɔːrəs/ KWAHN-tə-SOR-əs) is a genus of basal two-legged, plant-eating elasmarian ornithischian dinosaur that lived in Australia about 125-112 million years ago, when the continent was still partly south of the Antarctic Circle.

One characteristic of the "Polar Victorian" euornithopods are distinctive spurs, or trochanters, on the upper surface of the thigh bone (or femur), where muscle was attached.

The holotype of Qantassaurus was discovered on 27 February 1996, during the third annual field season of the Dinosaur Dreaming project, a dig jointly run by Monash University and the National Museum of Victoria.

[5] The dig occurred on the beach of the Bunurong Marine Park at the intertidal site known as Flat Rocks, near Inverloch, in southeastern Victoria, Australia.

The rock outcrops at this site are part of the Wonthaggi Formation of the Strzelecki Group, which during the Barremian stage were deposited in floodplains with braided river channels.

It was named Qantassaurus intrepidus by Patricia Vickers-Rich and Tom Rich in 1999,[1] in honor of the Queensland and Northern Territory Aerial Services, which shipped fossils around the country as part of the Great Russian Dinosaurs Exhibit between 1993 and 1996, and sponsored expeditions to South America and Eastern Europe.