SM UC-20 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 29 August 1915 and was launched on 1 April 1916. She was commissioned into the German Imperial Navy on 7 September 1916 as SM UC-20. In 13 patrols UC-20 was credited with sinking 21 ships, either by torpedo or by mines laid. UC-20 was surrendered on 16 January 1919 and broken up at Preston in 1919–20.
Design Like all pre-UC-25 Type UC II submarines, UC-20 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 six-cylinder four-stroke diesel engines each producing (a total of ), two electric motors producing , and two propeller shafts. She had a dive time of 35 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-20 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one Uk L/30 deck gun. Her complement was twenty-six crew members.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate19 October 1916Frits Emil194Sunk17 November 1916Emilia1,159Sunk10 April 1917Abd Razik25Sunk11 April 1917Candia1,045Sunk14 April 1917Cinque Ottobre39Sunk14 April 1917Progresso31Sunk15 April 1917Alessio Cocco29Sunk18 May 1917Millicent Knight3,563Sunk25 May 1917Argentina97Sunk25 May 1917Ida46Sunk26 May 1917Unione Salvatore57Sunk26 May 1917Abd es Salem25Sunk26 May 1917Dandolo50Sunk26 May 1917Manoubia50Sunk26 May 1917Messaouda50Sunk26 May 1917San Francesco47Sunk27 May 1917Boldwell3,118Sunk26 August 1917Maurizio P.558Sunk4 January 1918Regina Elena7,940Sunk13 April 1918Giove5,037Damaged28 April 1918Verdun2,769Sunk4 May 1918Mergellina354Damaged4 June 1918Strombus6,163Damaged12 June 1918Poincare35Sunk
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