Berkhamsted, town (parish), Dacorum borough, administrative and historic county of Hertfordshire, southeastern England, 28 miles (45 km) northwest of London.
It lies on an old coaching route along the valley of the River Bulbourne of the Chiltern Hills, which now contains modern road, rail, and canal routes. A moated Norman castle has been thoroughly excavated and is preserved. Diversified light industry includes paper and furniture making. Pop. (2001) 16,498; (2011) 18,015.