SM UB-23 was a German Type UB II submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 30 April 1915 and launched on 9 October 1915. She was commissioned into the Imperial German Navy on 13 March 1916 as SM UB-23. The submarine sank 51 ships in 21 patrols for a total of . On 26 July 1917, UB-23 was badly damaged by a depth charge attack by off the Lizard; she put in at Corunna, Spain, on 29 July 1917 and was interned. On 22 January 1919 she was surrendered to France in accordance with the requirements of the Armistice with Germany, and she was broken up in Cherbourg in July 1921.
Design A Type UB II submarine, UB-23 had a displacement of when at the surface and while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered by two Körting six-cylinder, four-stroke diesel engines each producing a total , a Siemens-Schuckert electric motor producing , and one propeller shaft. She was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UB-23 was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a 45-second dive time.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate4 July 1916Queen Bee34Sunk5 July 1916Annie Anderson77Sunk5 July 1916Peep O’ Day52Sunk6 July 1916Girl Bessie62Sunk6 July 1916Nancy Hunnam58Sunk6 July 1916Newark Castle85Sunk6 July 1916Petunia58Sunk6 July 1916Watchful52Sunk24 July 1916Mary560Sunk26 July 1916Kentigern796Sunk27 July 1916Agenda226Sunk28 July 1916Andrew Ina50Sunk28 July 1916Good Design40Sunk28 July 1916Jane Stewart15Sunk28 July 1916Janet Overstone15Sunk28 July 1916Johan49Sunk28 July 1916Renown61Sunk28 July 1916Speedwell11Sunk28 July 1916Spero Meliora11Sunk28 July 1916Volunteer15Sunk3 September 1916General Archinard355Sunk6 September 1916Britannia48Sunk7 September 1916Emma19Sunk7 September 1916Farfadet17Sunk7 September 1916Jeanne D’Arc17Sunk7 September 1916Leonine20Sunk8 September 1916Marie Louise157Sunk8 September 1916Mayo1,880Sunk9 September 1916Gemma3,111Sunk9 September 1916Remora92Sunk21 October 1916Julia166Sunk21 October 1916Snestad2,350Sunk23 October 1916Alf196Sunk23 October 1916Antoine Allosia29Sunk23 October 1916Saint Pierre151Sunk23 October 1916Venus II784Sunk26 October 1916Saint Yves165Sunk30 November 1916Gaete170Sunk2 December 1916Harpalus1,445Sunk4 December 1916Nervion1,921Sunk8 December 1916Conch5,620Sunk7 January 1917Brenda249Sunk2 February 1917Gabrielle1,410Sunk31 March 1917Hestia959Sunk31 March 1917Lisbeth1,621Sunk4 April 1917Trevier3,006Sunk18 April 1917Marcel24Sunk31 May 1917Dirigo3,004Sunk2 June 1917Prudence25Sunk5 June 1917Laura Ann116Sunk30 June 1917Ilston2,426Sunk4 July 1917Gloire à Dieu419Damaged
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