HMS Ocelot (S17) is an Oberon-class diesel-electric submarine which was operated by the Royal Navy.
HMS Onslaught was a British Oberon-class attack submarine operated by the Royal Navy.
HMS Oberon was the lead ship of the Oberon-class submarines, operated by the Royal Navy.
HMS Odin was a British Oberon-class submarine operated by the Royal Navy.
HMS Sealion (S07) was a Porpoise-class submarine.
HMS Opportune (S20) was an Oberon-class submarine of the Royal Navy.
HMS Otus was a Royal Navy Oberon-class submarine launched in 1962. She was decommissioned in the early 1990s and is now a museum ship in Germany.
HMS Osiris (S13) was an Oberon-class submarine that served in the Royal Navy.
HMS Opossum (S19) was an Oberon-class submarine in service with the Royal Navy from 1964 to 1993.
HMS H44 was an H-class submarine of the Royal Navy. She was built by Armstrong Whitworth and launched on 17 February 1919. She served in the Second World War. She had a complement of twenty-two crew members. She was sold in 1944 and was broken up at Troon in February 1945.
HMS Cachalot (S06) was a Porpoise-class submarine. Her keel was laid down on 1 August 1955 by Scotts Shipbuilding and Engineering Company at Greenock. She was launched on 11 December 1957, and commissioned on 1 September 1959.
HMS Orpheus was an Oberon-class submarine of the Royal Navy.
HMS H4 was a British H-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on 11 January 1915 and was commissioned on 5 June 1915. After her commissioning, HMS H4 and sister ships H1, H2 and H3 crossed the Atlantic from St. John's, Newfoundland to Gibraltar being escorted by the armed merchant cruiser HMS Calgarian. H4 sank the U-boat UB-52 in the Adriatic on 23 May 1918. She was sold on 30 November 1921 in Malta.
HMS H7 was a British H-class submarine built by the Canadian Vickers Co, Montreal, Quebec, Canada. She was laid down on 19 May 1915 and was commissioned in June 1915. HMS H7 was sold in 1921. It had a complement of twenty-two crew members, a length of 171 feet (52 m), and a surfaced range of 1,600 nautical miles at 10 knots.
HMS H11 was a British H-class submarine built by Fore River Yard, Quincy, Massachusetts. She was laid down on an unknown date and was commissioned in 1915. H11 along with HMS H12 to HMS H20 were all built in America but were interned by the United States government until the United States entered World War I. H11 was sold on 20 October 1920 in Dover and lost on tow to the breaker's yard. The wreck was identified 2007.
HMS H12 was a British H-class submarine built by Fore River Yard, Quincy, Massachusetts. She was laid down on an unknown date and commissioned in 1915. HMS H12 along with HMS H11 and HMS H13 to HMS H20 were all built in America but were interned by the United States government until the United States entered World War I. HMS H12 was sold in April 1920 in Dover.
HMS Spearhead was a S-class submarine of the third batch built for the Royal Navy during World War II. She survived the war and was sold to Portugal. She was scrapped in 1967.
HMS H52 was a British H class submarine built by HM Dockyard, Pembroke Dock. She was laid down on an unknown date, launched on 31 March 1919 and commissioned on 16 December 1919, the last Welsh-built fighting ship to enter the British Royal Navy.
HMS H32 was a H-class submarine constructed for the Royal Navy. The submarine entered service in 1919 and served in the Second World War, one of only seven of the class to do so. During Warship Week 1942 H32 was adopted by Lydney RDC (Gloucestershire). The submarine was sold for scrap in 1944.
HMS Oberon was the prototype for the Odin-class submarine of the Royal Navy.
United Kingdom
