Marquis Cornwallis may refer to a number of ships named for Charles Cornwallis, 1st Marquess Cornwallis: , a 654 burthen ton merchantman that made a voyage transporting convicts to Australia. Marquis Cornwallis, was an East Indiaman launched in 1801, that the Royal Navy purchased in 1805 and commissioned as , renamed Akbar in 1811, and sold in the 1860s. was a brig launched at Sunderland. She traded widely, to the West Indies, the Iberian peninsula, and the Baltic. The American privateer captured her in 1814 but released her as a cartel. She was wrecked in 1823.