Slade Green is an area of South East London, England, within the London Borough of Bexley. It lies northeast of Bexleyheath, northwest of Dartford and south of Erith, and 13 miles (21 km) east-southeast of Charing Cross.

Historically Slade Green was part of the county of Kent. In 1965 it became part of the new ceremonial county of Greater London.

An Anglo-Saxon dictionary asserts that "Slade" most commonly meant a broad strip of grass-covered land. The London Borough of Bexley suggests the current name most likely derives from Saxon "Slade", with their definition being low-lying ground. An alternative is the Old Norse "Slad", meaning a place for launching boats. Most sources agree that "Green" was added to reflect the deep colour of the grass-covered ground. Sources differ on when Slade Green was first mentioned with one suggesting the 16th Century.

Collectors such as Flaxman Charles John Spurrell discovered diverse Palaeolithic fossils around Slade Green, along with flint artefacts that provide evidence of prehistoric human habitation. Pre-war maps indicate a barrow stood near the current Hazel Drive children's play area, and the Museum of London Archaeological Service revealed the presence of a prehistoric cookery pit at Hollywood Way.

Some sources claim the area is recorded in the Domesday Book as Hov, and others suggest this was Hou (later Howbury). An early translation states that Howbury was a hamlet on the bank of River Darent, which is approximately 1 km east of the small Slade Green hamlet recorded by 19th Century geographers. According to Bexley borough council, this medieval hamlet was held by Askell. Askell the Priest from Abingdon Abbey held estates in various parts of England and bequeathed titles to Hugh d'Avranches, Earl of Chester.

A moated seigneurial residence was built much closer Slade Green in the High Middle Ages, with its country house completed during the English Renaissance, and these structures were named Howbury Manor. An adjacent tithe barn, with 17th Century styling, has not been accurately dated. Surrounding green belt marshes contain willows thought to have been planted over 300 years ago to shelter livestock.

The communities of North End and Slades Green (formerly Slads Green) had remained disjointed throughout the British Agricultural Revolution. Samuel Lewis' 1848 A Topographical Dictionary of England states that Slades Green was the smaller hamlet with 66 people. While judicial, political and cultural boundaries are continually revised to address various concerns, the tracks of the North Kent Line have been the immovable border between North End and Slade Green since c. 1849.

Evidence suggests the region remained sparsely populated yet highly productive throughout the Industrial Revolution. The 1869–1882 Ordnance Survey recorded a particularly large "Sladesgreen Farm" with its south-west corner occupied by "The Corner Pin" beerhouse. The pub was demolished and rebuilt in 1958. The surrounding area was affectionately known locally as "Cabbage Island" in reference to the market gardens located between Moat Lane (formerly Whitehall Lane) and Slade Green Road (formerly Slade Green Lane). Victorian photographic evidence captures the high crop yield of these agricultural gardens at Slade Green. Historic maps also chronicle an increasing number of clay pits along the railway on the North End side of the tracks. Marshes are a natural source of clays and brick earths, and local firms produced large numbers of London stock bricks throughout the 19th Century. "Furner of Slade Green" operated the North End brickworks from 1867 to 1911. Slade Green gained a National School in 1868, and became a village when St. Augustine's Church opened in 1899.