Colnbrook is a large village in the unitary authority of Slough, in Berkshire, England. It is situated 3.5 miles (5.6 km) southeast of central Slough, 9 km (5.6 mi) east of Windsor and 19 miles (31 km) west of central London. Nearby villages include Horton, Datchet, Poyle and Wraysbury.
Colnbrook is in the Windsor constituency and its Member of Parliament is Adam Afriyie (Conservative). The town's mayor is Warren Johnson.