Marquis Cornwallis may refer to a number of ships:
Marquis Cornwallis (1789 ship), 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 HMS Cornwallis, renamed Akbar in 1811, and sold in the 1860s.