SM UC-74 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 19 October 1916. She was commissioned into the German Imperial Navy on 26 November 1916 as SM UC-74. In ten patrols UC-74 was credited with sinking 37 ships, either by torpedo or by mines laid. UC-74 was interned at Barcelona on 21 November 1918 when she ran out of fuel. The U-boat was surrendered to France on 26 March 1919 and was broken up at Toulon in July 1921.
A Type UC II submarine, UC-74 had a displacement of 410t when at the surface and 493t while submerged. She had a length overall of 50.45m (165.52feet), a beam of 5.22m (17.13feet), and a draught of 3.650NaN0. The submarine was powered by two six-cylinder four-stroke diesel engines each producing 290PS300PS (a total of 580PS600PS), two electric motors producing 620PS, and two propeller shafts. She had a dive time of 30 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-74 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8sp=usNaNsp=us Uk L/30 deck gun. Her complement was twenty-six crew members.
| Date | Name | Nationality | Tonnage[1] | Fate[2] | |
|---|---|---|---|---|---|
| 1 March 1917 | Durban |  Norway | 765 | Damaged | |
| 8 March 1917 | Ares |  Netherlands | 3,783 | Sunk | |
| 10 March 1917 | James Burton Cook |  United Kingdom | 133 | Sunk | |
| 15 April 1917 | United Kingdom | 8,939 | Sunk | ||
| 28 April 1917 | Pontiac | United Kingdom | 3,345 | Sunk | |
| 2 May 1917 | Alessandria | 8,006 | Sunk | ||
| 29 May 1917 | Aghia Ton Aghion |  Greece | 30 | Sunk | |
| 29 May 1917 | Kirikos | Greece | 84 | Sunk | |
| 29 May 1917 | Yarra |  France | 4,163 | Sunk | |
| 10 June 1917 | Stylianos |  Egypt | 389 | Sunk | |
| 11 June 1917 | Benha | United Kingdom | 1,878 | Sunk | |
| 19 August 1917 | Aghios Georgios | Greece | 161 | Sunk | |
| 24 August 1917 | Parana | France | 6,248 | Sunk | |
| 30 August 1917 | Athinai | Greece | 988 | Sunk | |
| 31 August 1917 | Eleni | Greece | 679 | Sunk | |
| 1 September 1917 | Amiral Olry | France | 5,567 | Sunk | |
| 3 September 1917 | Agios Andreas | Greece | 68 | Sunk | |
| 6 September 1917 | Ville De Strasbourg | France | 2,167 | Sunk | |
| 6 September 1917 | Aghios Georgios | Greece | 897 | Sunk | |
| 30 September 1917 | HMT Charlsin | 241 | Sunk | ||
| 6 October 1917 | Civilian | United Kingdom | 7,871 | Sunk | |
| 11 October 1917 | Panormitis | France | 59 | Sunk | |
| 14 October 1917 | Semantha | United Kingdom | 2,847 | Sunk | |
| 15 October 1917 | White Head | United Kingdom | 1,172 | Sunk | |
| 14 November 1917 | Prophet | United Kingdom | 3,230 | Sunk | |
| 25 November 1917 | Ovid | United Kingdom | 4,159 | Sunk | |
| 28 November 1917 | Jane Radcliffe | United Kingdom | 4,074 | Sunk | |
| 4 March 1918 | Clan Graham | United Kingdom | 5,213 | Damaged | |
| 5 March 1918 | Roxburgh | United Kingdom | 4,630 | Sunk | |
| 10 March 1918 | Chagres | United Kingdom | 5,288 | Sunk | |
| 30 April 1918 | Kalliope | United Kingdom | 114 | Sunk | |
| 1 May 1918 | Nikolaos | Greece | 50 | Sunk | |
| 5 May 1918 | Sayeda | Egypt | 18 | Sunk | |
| 13 May 1918 | HMT Loch Naver | 216 | Sunk | ||
| 11 July 1918 | Roberto |  Spain | 910 | Sunk | |
| 26 July 1918 | Monastir | France | 1,915 | Damaged | |
| 23 October 1918 | Aghios Gerasimos | Greece | 85 | Sunk | |
| 2 November 1918 | Murcia | United Kingdom | 4,871 | Sunk | |
| 2 November 1918 | Surada | United Kingdom | 5,324 | Sunk | |
| 4 November 1918 | War Roach | United Kingdom | 5,215 | Damaged | |
| 5 November 1918 | Stavnos | 38 | Sunk |