Swan was a 200-ton warship of the English navy, launched as a Royalist vessel in 1641 but captured by the Commonwealth of England when her crew revolted in 1645. She carried twelve cannons, which were cast by John Browne. The warship was a part of Oliver Cromwell's fleet of six vessels which attacked a Royalist stronghold at Duart Castle in Mull, UK, during the English Civil War. She sank in storm on 13 September 1653 off the west coast of Scotland.