SM UB-105 was a German Type UB III submarine or U-boat in the Imperial German Navy during World War I. She was commissioned into the Imperial German Navy on 14 January 1918 as SM UB-105.
UB-105 was surrendered to Britain on 16 January 1919 and broken up in Felixstowe in 1922.
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 7 July 1917. UB-105 was commissioned early the next year under the command of Kptlt. Wilhelm Marschall. Like all Type UB III submarines, UB-105 carried 10 torpedoes and was armed with a 8.82NaN2 deck gun. UB-105 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7420nmi. UB-105 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[1] | Fate[2] | |
|---|---|---|---|---|---|
| 23 April 1918 | Restaurado |  Portugal | 136 | Sunk | |
| 24 April 1918 | Leonor | Portugal | 166 | Sunk | |
| 25 April 1918 | HMS Cowslip | 1,290 | Sunk | ||
| 29 April 1918 | City of Pensacola |  United States | 705 | Sunk | |
| 29 April 1918 | Kut Sang |  United Kingdom | 4,895 | Sunk | |
| 30 April 1918 | Conway | United Kingdom | 4,003 | Sunk | |
| 3 June 1918 | Nora | United Kingdom | 3,933 | Sunk | |
| 5 June 1918 | HMS Snaefell | 1,368 | Sunk | ||
| 6 June 1918 | Archbank | United Kingdom | 3,767 | Sunk | |
| 6 June 1918 | Menzaleh | United Kingdom | 1,859 | Sunk | |
| 9 June 1918 | Clan Forbes | United Kingdom | 3,946 | Sunk | |
| 9 June 1918 | Pundit | United Kingdom | 5,917 | Sunk | |
| 9 June 1918 | Tewfikieh | United Kingdom | 2,490 | Sunk | |
| 14 July 1918 | Branksome Hall | United Kingdom | 4,262 | Sunk | |
| 14 July 1918 | Waitemata | United Kingdom | 5,432 | Sunk | |
| 14 July 1918 | Djemnah |  France | 3,716 | Sunk | |
| 19 July 1918 | Eguskia |  Spain | 1,181 | Sunk | |
| 18 September 1918 | Antonietta | 93 | Sunk | ||
| 20 September 1918 | Angelina Pasquale | 29 | Sunk | ||
| 20 September 1918 | San Michele | 24 | Sunk | ||
| 21 September 1918 | Santo Fortunato | 24 | Sunk | ||
| 3 October 1918 | Ariel | United Kingdom | 3,428 | Sunk | |
| 3 October 1918 | Saint Luc | France | 2,456 | Sunk | |
| 7 October 1918 | Madeira | Portugal | 4,792 | Sunk | |
| 7 October 1918 | Saint Barnabe | France | 5,184 | Sunk | |
| 12 October 1918 | Tripoli II | 958 | Sunk |