1735–1790; died 1790) was an English marine painter, who exhibited at the Free Society of Artists in 1763 and 1768 and at the Royal Academy from 1774 to 1789.
Thomas Mitchell was a shipwright by profession who also practised with some success as a painter of marine subjects.
He first exhibited at the Free Society of Artists in 1763, when he was residing on Tower Hill.
He exhibited there again in 1768 and the following years, when he was employed as assistant shipbuilder at Chatham dockyard.
A number of drawings by Mitchell entered the print room at the British Museum, the earliest dated being a view of Westminster Bridge in 1735.