Addlestone ( or ) is a town in Surrey, England, approximately 18.6 mi (29.9 km) southwest of London. The town is recorded as Attelsdene in 1241 and its name is probably derived from that of a Saxon landowner. Previously part of the parish of neighbouring Chertsey, it began to grow as significant settlement in its own right from the mid-18th century. The Civic Centre, which houses the offices of Runnymede Borough Council, Addlestone Police Station and the local library, opened in 2008.
Addlestone is home to the ancient Crouch Oak tree, under which it is said Queen Elizabeth I picnicked. It also marked the edge of Windsor Forest before it was largely cut down for fields and settlements.
Addlestone railway station is on the Chertsey Branch Line and train services to and from London Waterloo are operated by South Western Railway. The town is within the M25, close to junction 11.