Lightwater is a village in the Surrey Heath district of Surrey, England, about 27 miles (43 km) southwest of central London. Immediately surrounding towns and villages include Bagshot, Deepcut, Windlesham, Camberley, and West End, Woking. It is bounded to the north-west by the M3 motorway and to the north-east by the "Lightwater Bypass" (A322). To the south-east it is bounded by the "Red Road" (B311), while to the south-west there are vehicle-testing tracks owned by the Ministry of Defence.