Captain Marcus Rainsford (c. 1758 – 4 November 1817)[1] was a British Army officer who fought in the Battle of Camden in 1780, during the American Revolutionary War.

He obtained a commission and saw service in the 105th regiment, commanded by Francis, lord Rawdon (afterwards second) Earl of Moira, during the American War of Independence.

In 1794 he served under the Duke of York in the Netherlands, during the Flanders Campaign and was afterwards employed in raising black troops in the West Indies.

He was subsequently arrested and condemned to death as a spy, but was reprieved and eventually set at liberty.

Rainsford died in November 1817 and is buried in St Giles in the Fields, London, England.