'US' was the designation of Allied military convoys (together with a numerical and sometimes a literal suffix) plying the route from Australia or New Zealand, and later Colombo, Ceylon, to the Suez Canal initially to bring Australian and New Zealand troops into the Middle East as replacements for British troops required in Europe, and as such reciprocals of the 'SU' series (January 1940/August 1943).

The first of these 40 convoys was US.1 of 6 January/10 February 1940 from Wellington, New Zealand, with the 15,276-ton French Athos II (from Colombo to Suez), 11,162-ton British Dunera, 21,517-ton British Empress of Canada, 26,032-ton British Empress of Japan carrying 789 troops, 23,456-ton British Orcades carrying 1,593 troops, 20,043-ton British Orford carrying 1,263 troops, 23,371-ton British Orion, 20,026-ton British Otranto carrying 1,404 troops, 16,737-ton British Rangitata, 11,030-ton Polish Sobieski, 22,281-ton British Strathaird carrying 1,350 troops, and 22,283-ton British Strathnaver carrying 1,456 troops.

The last of these convoys, operating from Bombay to Aden, was US.31 of 25/30 August 1943 with the 10,683-ton British Staffordshire.