Arriva Shires & Essex is a division of Arriva, with operations in Essex, Hertfordshire, Bedfordshire, Buckinghamshire and London. It is one of many private operators of London Buses. Until 2002 its operations included Colchester. In February 2006, the company bought MK Metro.

Operations are split between two registered companies, Arriva East Herts & Essex and Arriva The Shires.

Arriva East Herts & Essex Ltd is based in Harlow, and operate two bus garages in Harlow (Forth Avenue) and Ware (Marsh Lane).

Arriva East Herts & Essex emerged from London Country North East, one of the successor companies of London Country Bus Services. LCNE was broken in two. One of the successor companies, County Bus & Coach, with depots at Harlow, Hertford and Grays, was bought by its management in 1990. In 1994 County was sold to West Midlands Travel, itself bought by National Express Group in 1995. The Cowie Group (which became Arriva in 1997) bought County from National Express Group in 1996. County Bus & Coach was renamed Arriva East Herts & Essex Ltd in 1998.

Essex ( /ˈɛsɨks/) is a ceremonial and non-metropolitan county in the East of England, and one of the home counties. It is located to the northeast of Greater London. It borders with Cambridgeshire and Suffolk to the north, Hertfordshire to the west, Kent to the South and London to the south west. Essex County Council is the principal local authority for much of the county, sharing functions with twelve district councils. The county town is Chelmsford. The southern Essex boroughs of Thurrock and Southend-on-Sea are governed separately as unitary authorities. It was established in antiquity and formed the eastern portion of the Kingdom of Essex. Sections of the county closer to London are part of the Metropolitan Green Belt, which prohibits development. It is the location of the regionally significant Lakeside Shopping Centre and London Stansted Airport; and the new towns of Basildon and Harlow.

The name Essex originates in the Anglo-Saxon period of the Early Middle Ages and has its root in the Old English Ēastseaxe (i.e. the "East Saxons"), the eastern kingdom of the Saxons. Originally (in 527 AD) it occupied territory to the north of the River Thames, incorporating all of what later became Middlesex and most of what later became Hertfordshire, though its territory was later restricted to lands east of the River Lea.Colchester in the north east of the county is Britain's oldest recorded town, dating back to before the Roman conquest, when it was known as Camulodunum and was sufficiently well-developed to have its own mint. Subsequently the Kingdom of Essex was subsumed into the Kingdom of England and Essex eventually became a county.