SM UC-4 was a German Type UC I minelayer submarine or U-boat in the German Imperial Navy () during World War I. The U-boat had been ordered by November 1914 and was launched on 6 June 1915. She was commissioned into the German Imperial Navy on 10 June 1915 as SM UC-4."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. Mines laid by UC-4 in her 73 patrols were credited with sinking 36 ships. UC-4 was scuttled off the coast of Flanders during the German evacuation on 5 October 1918.
Design A Type UC I submarine, UC-4 had a displacement of when at the surface and while submerged. She had a length overall of , a beam of , and a draught of . The submarine was powered by one Daimler-Motoren-Gesellschaft six-cylinder, four-stroke diesel engine producing , an electric motor producing , and one propeller shaft. She was capable of operating at a depth of .
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 . UC-4 was fitted with six mine tubes, twelve UC 120 mines, and one machine gun. She was built by AG Vulcan Stettin and her complement was fourteen crew members.
Summary of raiding history DateNameNationalityTonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.Fate15 August 1915Ladoga6,136Sunk16 August 1915Linnea (n-1)739Sunk12 February 1916Aduatiek2,221Sunk12 February 1916Cedarwood654Sunk13 February 1916Tergestea4,308Sunk29 February 1916Den of Ogil5,689Damaged27 October 1916Bygdo2,345Sunk28 October 1916Sparta480Sunk9 November 1916Sunniside447Sunk25 November 1916HMT Burnley275Sunk3 December 1916HMT Remarko245Sunk5 December 1916HMT Tervani457Sunk7 January 1917HMT Donside182Sunk18 January 1917Dagmar758Sunk20 January 1917HMT New Comet177Sunk13 February 1917HMT Sisters Melville260Sunk23 February 1917Grenadier1,004Sunk11 March 1917Kwasind2,211Sunk12 March 1917Ambient1,517Sunk12 March 1917Pontypridd1,556Sunk3 June 1917Giralda46Sunk4 July 1917Chrysolite57Sunk7 July 1917HMT Kelvin322Sunk20 July 1917HMS Queen of the North594Sunk5 September 1917HMT Eros286Sunk20 October 1917HMT Vitality202Sunk11 November 1917Lapwing1,192Sunk13 November 1917Axminster1,905Sunk23 December 1917Grantley Hall4,008Sunk25 February 1918Rubio2,395Sunk26 February 1918Berwen3,752Damaged5 March 1918Coalgas2,257Sunk5 March 1918Estrella1,740Sunk5 March 1918Tusnastabb1,136Sunk12 April 1918Lonhelen1,281Sunk20 April 1918HMT Numitor242Sunk25 April 1918HMS St. Seiriol928Sunk26 June 1918HMT Achilles II225Sunk
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