SM UB-108 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 1 March 1918 as SM UB-108.
UB-108 was lost in July 1918 in the English Channel.
See main article: Type UB III submarine. She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 21 July 1917. UB-108 was commissioned early the next year under the command of Oblt.z.S. Wilhelm Amberger. Like all Type UB III submarines, UB-108 carried 10 torpedoes and was armed with a 8.82NaN2 deck gun. UB-108 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7420nmi. UB-108 had a displacement of 519lk=inNaNlk=in while surfaced and 649t when submerged. Her engines enabled her to travel at 13.3kn when surfaced and when submerged.
| Date | Name | Nationality | Tonnage[1] | Fate[2] | |
|---|---|---|---|---|---|
| 7 June 1918 | Diana |  United Kingdom | 1,119 | Sunk | |
| 12 June 1918 | Kennington | United Kingdom | 1,536 | Sunk |