Thomas Brassey (7 November 1805 – 8 December 1870) was a civil engineering contractor and manufacturer of building materials. At the time of his death, he was responsible for building 1 in every 20 miles of railway worldwide.
Born in Buerton, the son of a farmer, he attended school in nearby Chester. After an apprenticeship in Overton, Flintshire, he established a business in Birkenhead. His first railway commission was Penkridge Viaduct, completed in 1837.
Brassey was responsible for building about one-third of Britain's railways and three-quarters of those in France, as well as major lines across Europe and in Canada, Australia, S. America and India. He also constructed the associated docks, bridges, viaducts, stations, tunnels and drainage works. His other works included steamships, mines, locomotive factories, marine telegraphy and water supply and sewerage systems, including part of the London sewerage system. His estate was valued at over £5 million.