HMS Sultan is a stone frigate of the Royal Navy in Gosport, Hampshire, England.

The site was originally RAF Gosport it was then transferred to the Royal Navy during 1945 as Royal Naval Air Station Sultan (HMS Siskin) (Hence a nearby school being named Siskin School) it was then renamed HMS Sultan on 1 June 1956 when the airfield side was closed down and a Mechanical Repair Establishment was moved here from the Flathouse area by Portsmouth Dockyard.

The site was also home to HMS Centurion between 1970 and 1994, as a drafting depot and a pay and accounting centre.

It was proposed that Submarine Engineer Training would move to HM Naval Base Clyde in 2024, Mechanical Engineering Training to HMS Collingwood in 2025 and the Admiralty Interview Board to HM Naval Base Portsmouth in 2026.

[98] However, in December 2022, the Ministry of Defence announced that the closure had been reversed and HMS Sultan was to remain open.