Addlestone ( or ) is the administrative town of the borough of Runnymede in the county of Surrey, England. The town lies just within the M25 motorway, and within the Greater London Urban Area. Addlestone has an ancient oak named The Crouch Oak and is centred southwest of London. Junction 11 of the M25 motorway serves the roads local to Addlestone and Chertsey, the adjoining town in which it was historically included. Addlestone has its own railway station on the Chertsey Branch Line, four principal bus services and is home to the post-junior parts of St George's College.