'AC' (i) was the designation for British convoys (together with a numerical suffix) plying the route from Alexandria to Benghazi or Tobruk on the coast of North Africa (14 February/6 April 1941).

Tasked with the delivery of supplies and equipment for the ongoing operations of Major General R. O’Connor’s Western Desert Force in its 'Compass' (i) offensive to the west, the AC.1 convoy which departed Alexandria on 14 February 1941 passed as far to the west as Benghazi, while the AC.3 convoy comprised the 6,372-ton Thurland Castle and 3,791-ton Ulster Prince and steamed to Tobruk.