SM UC-27 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 29 August 1915 and was launched on 28 June 1916. She was commissioned into the German Imperial Navy on 25 July 1916 as SM UC-27. In 14 patrols UC-27 was credited with sinking 58 ships, either by torpedo or by mines laid. UC-27 was surrendered to France on 3 February 1919 and was broken up at Landerneau in July 1921.