The New South Wales Marine Corps (1786–1792) was an ad hoc volunteer unit that the British Royal Navy created to guard the convicts aboard the First Fleet to Australia, and to preserve "subordination and regularity" in the penal colony in New South Wales.

Lieutenant General Watkin Tench was a British marine officer who is best known for publishing two books describing his experiences in the First Fleet, which established the first European settlement in Australia in 1788. His two accounts, Narrative of the Expedition to Botany Bay and Complete Account of the Settlement at Port Jackson provide an account of the arrival and first four years of the colony.