Two ships of the Royal Navy have borne the name HMS Sepoy, whilst another two were planned but never entered service:
HMS Sepoy was to have been a wooden screw gunvessel. She was ordered in 1846 but was cancelled in 1849. was a wooden screw gunboat launched in 1856 and broken up in 1868. was an launched in 1918 and sold in 1932. HMS Sepoy was to have been a . She was launched in 1943 but retained by the US Navy as .