There have been six ships of the Royal Navy named HMS Lancaster:

• HMS Lancaster (1694) was an 80-gun first rate built in 1694, then rebuilt and relaunched in 1722, and rebuilt for a third time to a 66-gun third rate in 1749.
• HMS Lancaster (1797) was an East Indiaman, fitted out as a third rate 64-gun ship in 1797.
• HMS Lancaster (1823) was a frigate of 1823, scrapped in 1864.
• HMS Lancaster (1902) was a Monmouth-class cruiser of 1902 which paid off in 1919.
• HMS Lancaster (G05), formerly USS Philip, was a Wickes-class destroyer transferred as part of the 1940 Destroyers for Bases Agreement.
• HMS Lancaster (F229), a Type 23 frigate commissioned in 1992 and currently in service.

Ships that have borne the name Lancaster for the Royal Navy have earned the following battle honours;

• Louisburg 1758
• Camperdown 1797
• Atlantic 1941
• Arctic 1942
• North Sea 1943–45

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.