Arriva Southern Counties is a bus operator in London, Surrey, West Sussex, East Sussex, Kent and Essex in England. It is a subsidiary of Arriva.
In November 1986 the National Bus Company sold Maidstone & District in a management buyout to Einkorn Limited. In June 1988 New Enterprise Coaches of Tonbridge was purchased, followed in December 1991 by four buses and their associated Kent County Council services from Shearings, and in June 1992 Boro'line Maidstone.
In 1990 British Bus purchased the Cranleigh, Guildford and Woking based operations of Alder Valley followed in 1993 by Colchester Borough Transport and Southend Transport.
In April 1995 Einkorn was sold to British Bus, which had purchased Kentish Bus in July 1994 and Londonlinks in 1988. In August 1995 Einkorn was renamed Invictaway.Invictaway was previously the name of the Maidstone & District commuter services to London, which were renamed Green Line at the same time.
In July 1996 British Bus was taken over by the Cowie Group. Invictaway was renamed Arriva Southern Counties in April 1998, and Arriva transferred London & Country (also owned by British Bus) to it. The subsidiary operating companies therefore became: