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.
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 deck gun. UB-105 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-105 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.