'TO' (i) was the designation of Allied convoys (together with a numerical suffix) plying the route from Trinidad to Curaçao, Netherlands West Indies, and as such reciprocals of the 'OT' (i) series (May/June 1942).

The first of these convoys was TO.1 of 23/26 May with the 9,813-ton British Empire Airman II, 8,602-ton British Empire Silver, 12,190-ton British F. J. Wolfe, 9,931-ton Norwegian Kaldfonn, 9,813-ton Norwegian Norholm, 8,071-ton British San Emiliano and 11,015-ton Norwegian Thorshavet. The last was TO.10 of 26/28 June with the 8,718-ton Belgian Ampetco, 8,017-ton British Ancylus, 6,990-ton British British Yeoman, 7,920-ton Norwegian Orwell, 7,813-ton British Roxane, 6,261-ton British Saluta, 7,316-ton British San Amado and 1,975-ton Norwegian San Andres.