HMS Lancaster was an 80-gun third rate ship of the line

Ship of the line

A ship of the line was a type of naval warship constructed from the 17th through the mid-19th century to take part in the naval tactic known as the line of battle, in which two columns of opposing warships would manoeuvre to bring the greatest weight of broadside guns to bear...

 of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

, launched at Bursledon

Bursledon

Bursledon is a village on the River Hamble in Hampshire, England. It is located within the borough of Eastleigh. Close to the city of Southampton, Bursledon has a railway station, a marina, dockyards and the Bursledon Windmill. Nearby villages include Swanwick, Hamble-le-Rice, Netley and Sarisbury...

 on 3 April 1694.

She was rebuilt according to the 1719 Establishment

1719 Establishment

The 1719 Establishment was the first formal 'Establishment' laid down to govern the construction of all ships built or rebuilt down to those of 20 carriage guns, whether in the Royal Dockyards or by commercial contractors...

 at Portsmouth

Portsmouth

Portsmouth is the second largest city in the ceremonial county of Hampshire on the south coast of England. Portsmouth is notable for being the United Kingdom's only island city; it is located mainly on Portsea Island...

, 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

Woolwich Dockyard

Woolwich Dockyard was an English naval dockyard founded by King Henry VIII in 1512 to build his flagship Henri Grâce à Dieu , the largest ship of its day....

 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.

Lancaster was broken up in 1773.