Thatcham is a town in the historic county of Berkshire, England centred 3 miles (5 km) east of Newbury and 15 miles (24 km) west of Reading. Its housing and consequently population grew rapidly in the second half of the 20th century from 5,000 in 1951 and 7,500 in 1961 to 22,824 in 2001.
It straddles the River Kennet, the Kennet and Avon Canal, the A4 and the course of a Roman road. It is served by Thatcham railway station on the line between the larger nearby towns mentioned. Local employment is chiefly in light industrial premises, sales and distribution, retail and public sectors, see also West Berkshire, its district.