SM UC-34

SM UC-34 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) during World War I. The U-boat was ordered on 20 November 1915 and was launched on 6 May 1916. She was commissioned into the German Imperial Navy on 25 September 1916 as SM UC-34. In nine patrols UC-34 was credited with sinking 21 ships, either by torpedo or by mines laid.

On 30 December 1917 under the command of Oberleutnant zur See Horst Obermüller, UC-34 torpedoed the British troop ship HMT Aragon off the Port of Alexandria. Aragon's escort, the destroyer HMS Attack (1911), rescued 300 to 400 survivors but then UC-34 torpedoed and sank her was well. Of 2,500 personnel who had been aboard Aragon, 610 were killed.

UC-34 was scuttled at Pola on 28 October 1918 on the surrender of Austria-Hungary.