Mulligans Flat Nature Reserve is situated in the Gungahlin district on the northern outskirts of Canberra in the Australian Capital Territory in Australia. The Reserve consists of 781 hectares of grassy woodland with some open grassland and a scattering of dams. The reserve is home to about 150 species of wild flowers which grow among stands of red gum and yellow box trees, making it one of the most significant nature reserves in the south east of New South Wales.