SM UB-103 was a German Type UB III submarine or U-boat in the German Imperial Navy (de|Kaiserliche Marine) during World War I. She was commissioned on 18 December 1917 as SM UB-103.
UB-103 was sunk in the English Channel by British warships and SSZ 1, a SSZ class blimp. All hands were lost.[1]
See main article: Type UB III submarine. She was built by Blohm & Voss of Hamburg and, after just under a year of construction, launched at Hamburg on 7 July 1917. UB-103 was commissioned later the same year, under the command of KptLt Paul Hundius. Like all Type UB III submarines, UB-103 carried 10 torpedoes and was armed with a 8.82NaN2 deck gun. UB-103 had a crew of up to three officers and 31 men, and its cruising range was 7420nmi. UB-103 had a displacement of 510lk=inNaNlk=in while surfaced and 629t when submerged. Her engines enabled her to travel at 13.3kn when surfaced and when submerged.
| Date | Name | Nationality | Tonnage[2] | Fate[3] | |
|---|---|---|---|---|---|
| 20 March 1918 | Eros |  Sweden | 858 | Sunk | |
| 21 March 1918 | Tyrhaug |  United Kingdom | 1,483 | Sunk | |
| 24 March 1918 | Anteros | United Kingdom | 4,241 | Sunk | |
| 22 April 1918 | Eric Calvert | United Kingdom | 1,862 | Sunk | |
| 28 April 1918 | Elba | United Kingdom | 1,081 | Sunk | |
| 2 May 1918 | Thorsa | United Kingdom | 1,319 | Sunk | |
| 3 May 1918 | Vasilefs Georgios |  Greece | 3,651 | Sunk | |
| 10 June 1918 | Borg | United Kingdom | 2,111 | Sunk | |
| 11 June 1918 | Lorle | United Kingdom | 2,686 | Sunk | |
| 12 June 1918 | Kul | United Kingdom | 1,095 | Sunk | |
| 11 July 1918 | Kong Guttorm |  Norway | 731 | Sunk | |
| 15 July 1918 | Cap Breton |  France | 1,464 | Sunk | |
| 15 July 1918 | Vendee | France | 892 | Sunk | |
| 16 July 1918 | Lyndiane | France | 1,564 | Sunk | |
| 21 July 1918 | Arvor | France | 961 | Sunk |