'UR' was the designation of Allied convoys (together with a numerical suffix) plying the route from Loch Ewe (later Oban and Belfast Lough) to Reykjavik, Iceland, and as such reciprocals of the 'RU' series (December 1941/May 1945).

The first of 169 such convoys was UR.1 of 13/17 December 1941 with the 1,580-ton Icelandic Bruarfoss, 984-ton British Hengist, 399-ton Norwegian Jan Mayen, 5,171-ton British Lowther Castle and 840-ton British Rota. The last was UR.164 of 26/30 May 1945 with the 1,977-ton British Gunvor Maersk, 188-ton Swedish Harald, 1,474-ton Norwegian Lyra and 1,321-ton Svanholm.