Thomas Charles John Bain (29 September 1830 in Graaff-Reinet – 29 September 1893) was a South African road engineer.
As a prolific road building pioneer, Bain was responsible for the planning and construction of more than 900 km of roads and mountain passes, many of them still in use today, over a career spanning from 1848 until 1888.
These passes through the mountain ranges between the thin coastal plain and the interior of the former Cape Colony in South Africa, played a major role in opening up the vast hinterland of South Africa.