The Dunbar was a 64-gun second rate ship of the line of the Commonwealth of England, originally built at Deptford, and launched in 1656.

Taken into the English Royal Navy and re-named HMS Henry in 1660, she served until 1682, when she was lost in an accidental fire.

[1][2] The Dunbar was one of four Second rates ordered by the Council of State on 3 July 1654 as part of the 1654 Construction Programme; she was built by Master Shipwright Manley Callis at Deptford Dockyard, Kent and launched in about May 1656 for the Navy of the Commonwealth of England.

[3] During the Second Anglo-Dutch War HMS Henry took part in the Battle of Lowestoft on 3 June 1665 as the flagship of Vice-Admiral Sir George Ayscue, in the Four Days' Battle of 1–4 June 1666 as the flagship of Rear-Admiral Sir John Harman (when she was severely damaged), and in the St James Day Battle on 25 July 1666 as the flagship of Rear-Admiral Sir Robert Holmes.

[4][1] On 13 June 1667, during the Raid on the Medway, HMS Henry was driven ashore at Rochester Bridge, Kent,[5] but recommissioned after repairs on 6 April 1668.