SM UC-39 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 20 November 1915 and was launched on 25 June 1916. She was commissioned into the German Imperial Navy on 31 October 1916 as SM UC-39. In one patrol, UC-39 was credited with sinking three ships, either by torpedo or by mines laid. UC-39 was forced to the surface by a depth charge attack and then sunk by gunfire from the British destroyer Thrasher off Flamborough Head on 8 February 1917. Seven crew members died while 17 survived.