HMS Lancaster was an 80-gun third rate ship of the line of the Royal Navy, launched at Bursledon on 3 April 1694. She was rebuilt according to the 1719 Establishment at Portsmouth, from where she was relaunched on 1 September 1722. After this time, her armament of 80 guns, previously carried on two gundecks, was carried on three, though she continued to be classified as a third rate. On 15 February 1743 she was ordered to be taken to pieces and rebuilt at Woolwich Dockyard as a 66-gun third rate according to the 1741 proposals of the 1719 Establishment. This rebuild returned her to a two-decker, and she was relaunched on 22 April 1749.