Martins Heron is a suburb of Bracknell 25 miles (40 km) west of London in Berkshire, England. Martins Heron and the neighbouring suburb The Warren are after a Parliamentary Boundary review in the Bracknell constituency – until 2010 they were in the Windsor Constituency. It is in Harmans Water ward, which also includes parts of Bullbrook, and The Parks.

Bracknell is a town and civil parish in Berkshire, England, the westernmost area within the Greater London Urban Area and the administrative centre of the borough of Bracknell Forest. It lies 11 miles (18 km) to the east of Reading, 9 miles (14 km) south of Maidenhead, 10 miles (16 km) southwest of Windsor and 25 miles (40 km) west of central London. Bracknell is the third largest town in Berkshire.