The A25 road is one of the three cross-country two-digit numbered roads in the southeast of England, the others being the A26 from Newhaven to Maidstone and the A27 along the south coast. It carries traffic from Guildford in Surrey through Dorking, and thence eastward along the southern edge of the North Downs, to reach Maidstone in Kent. En route, the road passes through Reigate, Redhill, Nutfield, Bletchingley, Godstone, Oxted, Westerham, Brasted, Sevenoaks and Borough Green. A short distance beyond Borough Green, at Wrotham Heath, the A25 ends at a junction with the A20, which continues eastward towards Maidstone.

Most of the route, apart from those places where the modern road uses bypasses, follows the erstwhile turnpikes, brought into being in the 18th Century. Many of the inns along its path were one time staging inns. One of the earliest sections of the M25 motorway runs parallel and to the north of the A25: hence the London Orbital Road was numbered M25.

Its route lies just south of the ancient Pilgrims' Way.

See also

• Great Britain road numbering scheme