Southdown PSV Limited,[1] which traded as Southdown Buses, was a medium-sized country bus operator, with 18 routes across East Surrey, West Sussex, South London and Kent, 9 of which were school bus routes.

Southdown Buses operated mainly in Oxted, Horley, Redhill, Westerham, Lingfield, Caterham, and East Grinstead.

On 1 February 2023, Southdown Buses was purchased by the Go-Ahead Group, with the company being brought under the control of Brighton & Hove and the Southdown Buses identity initially being retained.

[3] Southdown Buses ceased operations on 2 September 2023, with services, staff and vehicles transferred to Metrobus.

In September 2016, the business was split with Southdown Buses' managing director, Steve Swain taking over the dealership and renaming it Chartwell Bus & Coach Sales.