HMS Flying Fox is a Royal Naval Reserve unit located in Bristol, England.

After the First World War the division was reformed and a new drill ship, the 24-class sloop HMS Flying Fox, was berthed at Bristol in 1924.

Renamed Severn Division after the Second World War, HMS Flying Fox moved ashore to its present HQ in 1972.

[2] In July 2023, the headquarters of the Royal Marines Reserve moved out of Dorset House so as to co-locate with the Royal Naval Reserve at HMS Flying Fox in Winterstoke Road.

[3] Co-located on the site in Winterstoke Road are the Naval Regional Officer for Wales and West of England,[4] the South West Area Sea Cadet HQ,[5] Winterstoke Detachment of Bristol Army Cadet Force,[6] and the regional headquarters of the Royal Marines Reserve.