Gnoo Blas circuit was a motor racing circuit at Orange, New South Wales, Australia. The circuit was formed from rural roads and highways outside of the town, around the grounds of Bloomfield Hospital and what is now known as Sir Jack Brabham Park. It was 6.03 km long. The name came from the Aboriginal name for nearby Mount Canobolas.
The first race meeting was staged over the Anniversary Day holiday weekend of 24 to 26 January 1953 and was organized by the Australian Sporting Car Club, the former promoters of the Easter car races at the Mount Panorama Circuit, Bathurst. The circuit played a crucial part in the growth of Australian open wheel racing in the post war era but faded before the peak created by the Tasman Series.