The Fourth Sea Lord and Chief of Naval Supplies, originally known as the Fourth Naval Lord, was formerly one of the Naval Lords and members of the Board of Admiralty, which controlled the Royal Navy of the United Kingdom.

The origin of this appointment dates back to 1830 when the post of Fourth Naval Lord was created until 1868 when it was re-styled Junior Naval Lord; this title remained until 1904 when it was again re-styled Fourth Sea Lord until 1964 when the Admiralty Department abolished this post.

[2] Its functions along with two other departments of state were merged within a new Ministry of Defence.

Following the merger a new post of Chief of Fleet Support was created, assuming the same responsibilities and duties until 2007 when it was renamed Chief of Materiel (Fleet).

In around August 2020, it was renamed as Director General Ships.