John Bull was a sailing ship built in 1799 at Liverpool for the trade in enslaved people.

[1] Voyage transporting enslaved people (1799–1800): She sailed from Liverpool on 5 September 1799 bound for the Bight of Biafra and Gulf of Guinea islands.

[2] The application for the letter evidences a large increase in her crew size, suggesting that she was going to engage in privateering.

[2] In July 1803 a vessel arriving at Falmouth reported that she had encountered the privateer John Bull, of 28 guns, of Liverpool.

John Bull and the privateer Union, of Guernsey, had captured a large French vessel from Île de France and taken her into Bantry Bay.

[10] Also in 1803 John Bull captured a small French merchant vessel trading with the West Indies.

On 5 June 1821, John Bull towed Jane, Brabin, master, into Cork, Ireland.

[17] Under the command of William Corlette John Bull arrived at Cork on 5 June, bound for New South Wales.

Also, a small cutter, built of English materials, about 22 tons burthen, with numerous other articles was also on offer.

[24] Captain Corlett was expected to sail immediately thereafter to the River Derwent, Tasmania to acquire a cargo of "black oil".

[22] She finally sailed from Hobart on 2 December with 1600 cedar logs, 10 tons of sperm oil, and wool.