'JA' was the designation of Allied convoys (together with a numerical suffix) plying the route from Colombo, Ceylon, to Aden, and as such reciprocals of the 'AJ' series (February 1944/February 1945).

The first of these convoys was JA.1 of 19/26 February 1944 with the 14,030-ton British armed merchant cruiser Alaunia (on her way to the UK for conversion into a repair ship) and 19,761-ton British Scythia, and the last was JA.3 of 31 January/12 February 1945 with the 8,334-ton British Broomdale.