Coordinates: 51°22′27″N 0°05′55″E / 51.3741°N 0.0986°E / 51.3741; 0.0986

Orpington is a suburban town and electoral ward in the London Borough of Bromley. It forms the southeastern edge of London's urban sprawl and is identified in the London Plan as one of 35 major centres in Greater London.

Stone Age tools have been found in several areas of Orpington, including Goddington Park, Priory Gardens, the Ramsden estate, and Poverest. Early Bronze Age pottery fragments have been found in the Park Avenue area. During the building of Ramsden Boys School in 1956, the remains of an Iron Age farmstead were excavated. The area was occupied in Roman times, as shown by Crofton Roman Villa, and the Roman bath-house at Fordcroft. The first record of the name Orpington occurs in 1038, when King Cnut's treasurer Eadsy gave land at "Orpedingetune" to the Monastery of Christ Church at Canterbury. The parish church also pre-dates the Domesday Book.

Until the railway came, the local commercial centre was nearby St Mary Cray, rather than Orpington. St Mary Cray had a regular market, and industry (paper mills and bell foundry), whereas Orpington was just a small country village surrounded by soft fruit farms, hopfields and orchards.