'DT' (iii) was the designation of Allied convoys (together with a numerical suffix) plying the route from Darwin to Thursday island, northern Australia, and as such reciprocals of the 'TD' series (February 1943/September 1944).

An early example of the series was DT.10 of 2/7 February 1943 with the 2,317-ton British Burwah and 2,459-ton British Kooliga. The last of the series was DT.83 of 18/22 September 1944 with the 3,391-ton British Shwedagon.