SM UC-68
 SM UC-68 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 12 January 1916 and was launched on 12 August 1916. She was commissioned into the German Imperial Navy on 17 December 1916 as SM UC-68. In 2 patrols UC-68 was credited with sinking 2 ships either by torpedo or by mines laid. UC-68 was sunk by the detonation of one of her own mines at Start Point on 13 March 1917.