Mosman Oil and Gas Limited, together with its subsidiaries, engages in the exploration, development, and production of oil and gas properties in Australia and the United States. It explores for helium, hydrogen, and hydrocarbons. The company was formerly known as Mosman Minerals Limited and changed its name to Mosman Oil and Gas Limited in December 2012. Mosman Oil and Gas Limited was incorporated in 2011 and is based in Sydney, Australia.