'TB' (ii) was the designation of Allied convoys (together with a numerical suffix) plying the route from Trinidad to Bahia, Brazil, and as such reciprocals of the 'BT' (i) series (January/July 1943).

The first of these 18 convoys was TB.1 of 5/23 January with the 6,194-ton US Birmingham City, 7,728-ton US Broad Arrow, 5,101-ton US Collingsworth, 5,965-ton US Felix Taussig, 1,464-ton Dutch Jupiter, 5,122-ton British King James, 6,928-ton US Massachusetts, 4,554-ton US Minotaur, 8,917-ton Panamanian Motocarline, 4,962-ton British Nailsea Meadow, 6,403-ton US Tennessee and 7,044-ton US W. F. Burdell.

The last of the convoys was TB.18 of 22 June/8 July, in which some of the vessels travelled only from Recife to Bahia, with the 5,786-ton Brazilian Almirante Alexandrino, 3,569-ton Brazilian Aracaju, 2,650-ton Venezuelan Aragua, 6,161-ton US C. A. Canfield, 2,927-ton Brazilian Carioca, 5,787-ton Brazilian Cearaloide, 1,659-ton Brazilian Chuiloide, 5,040-ton US City of St Louis, 5,613-ton British Clan Matheson, 6,370-ton Brazilian Dom Pedro I, 2,926-ton Brazilian Farrapo, 5,055-ton US Fluor Spar, 7,127-ton US Frederic R. Kellogg, 8,081-ton US Gulfport, 2,478-ton Brazilian Herval, 5,211-ton US John L. Clem, 6,407-ton US Reaper, 1,753-ton Norwegian Rita, 5,393-ton Norwegian Siranger, 5,043-ton US Wildwood and 4,973-ton Dutch Zypenberg.