SM UC-29 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 15 July 1916. She was commissioned into the German Imperial Navy on 15 August 1916 as SM UC-29. In an eight-month career, the UC-29 performed seven combat patrols into the Atlantic Ocean during the German war on Allied trade (Handelskrieg). In these patrols she was very successful, sinking 18 allied ships, totalling 21,903 tons. She also damaged 3 ships of 15,859 tons. On 7 June 1917 she torpedoed the British Q-ship HMS Pargust off the Irish coast, but was ambushed by her hidden armaments when she approached too close and was sunk with 23 hands. Pargust was commanded by British submarine hunter Gordon Campbell and had on board Ronald Niel Stuart and William Williams, who were awarded the Victoria Cross for their actions in the engagement.
Her wreck lies in Cork Harbour, Ireland.