HMS Cyclops (F31) was a submarine repair and depot ship of the Royal Navy. She was originally the passenger liner Indrabarah sister ship to Indralema, built by Laing, for the Indra Line Ltd then bought by The Admiralty, while she was building. She was launched on 27 October 1905. Cyclops was 460 feet (140.2 m) long between perpendiculars and 476 feet (145.1 m) overall, with a beam of 55 feet (16.8 m).