SM UB-30 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 22 July 1915 and launched on 16 November 1915. She was commissioned into the German Imperial Navy on 18 March 1916 as SM UB-30.

The submarine sank 18 ships in 19 patrols. They included the William Cory & Son collier SS Vernon in the North Sea off Spurn on 31 August 1917 and the Witherington and Everett Steam Ship Company collier SS Lightfoot in the English Channel off Selsey Bill on 16 March 1918.

UB-30 was sunk by two depth charges from south of Goodwin Sands at on 13 August 1918.

Design A Type UB II submarine, UB-30 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 Benz six-cylinder diesel engines producing a total , two Siemens-Schuckert electric motors 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-30 was fitted with two torpedo tubes, four torpedoes, and one Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.

Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate21 October 1916August346Sunk23 October 1916Elly88Sunk24 October 1916Elin127Sunk24 October 1916Ingersoll239Sunk24 October 1916Jenny Lind53Sunk24 October 1916Urpo111Sunk31 August 1917Vernon982Sunk3 September 1917Ragnhild1,495Sunk26 September 1917S.N.A. 31,709Sunk12 November 1917Morning Star129Sunk3 January 1918Gartland2,613Sunk5 January 1918Glenarm Head3,908Sunk12 January 1918Whorlton1,469Sunk2 February 1918Jaffa1,383Sunk9 February 1918Armenia5,463Damaged5 March 1918Clan Mackenzie6,544Damaged7 March 1918Braatt II1,834Sunk16 March 1918Lightfoot1,873Sunk18 June 1918Norfolk Coast782Sunk10 August 1918Madame Renee509Sunk

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