'XK' was the designation of Allied special 'Torch' and subsequent return convoys (together with a numerical suffix) plying the route from Gibraltar to the UK, and as such reciprocals of the 'KX' series (October 1942/May 1945).

The first of these 25 convoys was XK.1 of 2/14 October 1942 with the 1,851-ton British Almenara, 1,760-ton British Cara, 6,715-ton British Empire Cabot, 2,873-ton British Empire Caxton, 2,674-ton British Empire Kestrel, 2,479-ton British Empire Tern, 1,333-ton British Finland, 1,363-ton British Merkland, 2,481-ton British Ogmore Castle, 3,788-ton British Omega, 2,870-ton British Ottinge, 1,533-ton British Ousel and 1,791-ton Norwegian Sneland I.

The last of the convoys was XK.23 of 19/26 May 1945 with the 2,477-ton French Dunkerque, 4,707-ton Greek Maria L, 1,097-ton British Somerset Coast and 2,471-ton British Tintern Abbey.