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HMS Royal Oak was a Revenge-class battleship of the Royal Navy, sunk early in World War II.

She was laid down at Devonport, Devon on 15 January 1914 and launched on 17 November of that year. She was commissioned on 1 May 1916 having cost almost £2.5 million, the eleventh Royal Navy vessel to bear the Royal Oak name, replacing a pre-dreadnought that had been scrapped in 1914. She fought in the battle of Jutland, in line behind the Iron Duke of John Jellicoe.

She was refitted from 1922Events January 7 Dali Eireann ratifies the Anglo-Irish Treaty by 64-57 votes. January 10 Arthur Griffith is elected President of Dail Eireann January 11 First successful insulin treatment of diabetes. January 12 British government releases Irish prisoners to 1924Centuries: 19th century 20th century 21st century Decades: 1870s 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s Years: 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 See also 1924 in aviation 1924 in film 1924 in literature 1924 in mu, the main changes being the removal of torpedo tubes and a general upgrading of her anti-aircraft defences. She was modified again in 1934 at a cost of £1 million, much of the money being spent on upgrading her hull armour and torpedo bulges. She was assigned to the Mediterranean for most of the inter-war period and was accidentally struck by an anti-aircraft shell in February 1937 off the coast of Spain. She returned to the Home Fleet in 1938 and was made the flagship of the Second Battleship Division . She was preparing for another 30 month tour in the Mediterranean when World War II began. She was assigned to Scapa Flow and took part in a fruitless search for the German battleship Gneisenau in October 1939, in heavy seas her poor top speed left her out of contact for much of the time.

She was the first of the three Royal Navy battleships sunk in World War II. On 14 October 1939 she was moored within the defences of Scapa Flow. In a daring operation, the U-boat U-47, commanded by Günther Prien, entered the anchorage through Kirk Sound at high tide, passing over the sunken block ships with almost 1.5 m to spare. Most of the fleet was out to sea and Royal Oak was the only capital ship present, U-47 attacked her twice. The first salvo, fired at 01:04, did little damage but the second salvo of three torpedoes at 01:22 was successful. Royal Oak, struck amidships, rolled onto her side and sank in around 15 minutes. Of the crew 833 died, most almost immediately, 375 survived. 386 crew were rescued by the tender Daisy 2. U-47 escaped the anchorage an hour before the nets were raised and returned to Germany safely.

Initially the British believed that sabotage was the cause of the sinking, when a submarine attack was realised the anchorage was sealed, hours too late. Despite having warned of the paucity of anti-submarine defences, Sir Wilfred French , Admiral Commanding Orkney and Shetlands, was blamed for the loss and forcibly retired. The eastern approaches to Scapa Flow were sealed with extensive concrete walls, the Churchill Barriers , linking Lamb Holm, Glimp Holm, Burray and South Ronaldsay to Orkney Mainland. Anti-aircraft defences were also significantly strengthened.

See HMS Royal Oak for other ships of this name.