SM UC-61
 SM UC-61 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 laid down on 3 April 1916 and was launched on 11 November 1916. She was commissioned into the German Imperial Navy on 13 December 1916 as SM UC-61. In 5 patrols UC-61 was credited with sinking 11 ships either by torpedo or by mines laid. UC-61 was stranded north of Boulogne on 26 July 1917.