Langleybury is a country house and estate in Abbots Langley, Hertfordshire, England, about 3 miles (5 km) northwest of the centre of the town of Watford. The house stands on a low hill above the valley of the River Gade.
The estate was purchased in 1711 by Robert Raymond, then Solicitor General and later Attorney General, subsequently Baron Raymond, who was Lord Chief Justice of England and Wales from 1724 until 1732.
In 1720 he demolished the original house, of which little is known, and built the mansion which still stands on the site today. A park was laid out around the house in the later eighteenth century. His cipher, a griffin in a crown, can still be seen on the building.
On the death of his son, Robert Raymond, 2nd Baron Raymond, without issue in 1756, the manor was left to Sir Beversham Filmer, 5th Baronet, of East Sutton in Kent. He, dying without children in 1805, bequeathed it to his nephew, Sir John Filmer, 7th Baronet.) It then descended in the family till 1838. The Filmers were absentee landlords.
Fearnley Whittingstall 1838–1856
In 1838 Sir Edmund Filmer (8th Bt) sold the estate to Edmund Fearnley Whittingstall (né Fearnley), a Watford brewer. He started a bank in partnership with William Smith which went into bankruptcy soon after Whittingstall's death, forcing the sale of the estate in 1856.
Jones Loyd 1856–1947
The estate was then held by William Jones Loyd (1821–1885), a partner in the London branch of Jones Loyd & Co, who was High Sheriff of Hertfordshire in 1861 and cousin to Samuel Jones-Loyd, 1st Baron Overstone. Jones Loyd built the nearby church of St Paul in 1864. His son, Edward Henry Loyd, was High Sheriff of Hertfordshire in 1894.
In 1947 the estate was sold to Hertfordshire County Council who converted the house and grounds into a secondary school, named Langleybury School, which opened in 1949. In the late 1950s a modern school was built to the south of the mansion, which remained in use as part of the school and as teacher accommodation.
Langleybury School closed in 1996 and for a time partly housed Hertfordshire County Council's Social Services offices.
The empty modern school became a favoured film location site, notably for the Hope and Glory TV series of 1999. The site has been used in numerous TV shows and adverts, as well as films such as St Trinians and In The Heart Of The Sea. It is also used as a CCB (close combat battle) area for people who play Airsoft (an outdoor combat game) in the buildings which are still safe to enter. A children’s farm is situated in the old farm attached to the mansion house.
In conjunction with Newby Hall the Langleybury House was used in crafting the look of the fictitious manor house, Hundreds Hall, in the 2018 film The Little Stranger, directed by Lenny Abrahamson, starring Domhnall Gleeson and Ruth Wilson. In the article "Domestic Disturbances: Crafting The Look Of The Little Stranger" the production designer, Simon Elliott, explained how he was given free rein to modify Langleybury house for the production of the movie. 
- William Page, ed. (1908). "Abbots Langley". A History of the County of Hertford. Victoria County History. 2. pp. 323–328. Retrieved 2009-03-11.
- Leigh Rayment's Baronetage
- Whitaker, Allan (March 2006). Brewers in Hertfordshire. Univ of Hertfordshire Press. p. 224. ISBN 978-0-9542189-7-3. Archived from the original on 2007-12-10.
When he (George Whittingstall) died in 1822 he left £500,000 to a distant cousin Edmund Fearnley provided that he was prepared to change his name to Edmund Fearnley Whittingstall. This was legally recognised by 1825 and Edmund F. Whittingstall became the owner of the brewery.The brewery in question had previously been Smith's, and later became, in succession, Sedgwick's, Benskin's, Ind Coope, Allied Breweries, Carlsberg-Tetley, and now Carlsberg UK
- The Jurist. 1857. p. 388.
WILLIAM SMITH, Hemel Hempsted and Watford, Hertfordshire, banker, (trading under the style or firm of Smith & Whittingstall, and formerly carrying on trade with Edmund Fearnley Whittingstall, deceased), Sept. 25 at 11, and Oct. 24 at 12, London; Off. Ass. Cannan; Sols. Sedgwick, Watford; J. & J. H. Linklater & Co., 17, Sise-lane, Bucklersbury, —Pet. f. Aug. 26.
- Jones Loyd & Co was bought by the London and Westminster Bank in 1864, which through the intermediate steps of London County and Westminster Bank (1909), London County Westminster & Parr's Bank (1918), Westminster Bank (1923), National Westminster Bank (1970), is since 2000 part of the Royal Bank of Scotland Group
- Herts High Shrievalty Archived 2008-09-09 at the Wayback Machine
- Cilycwm history & heritage Archived 2008-02-03 at the Wayback Machine
- St Pauls, Langleybury[permanent dead link]
- "Consecration of St Paul's Church, Langleybury". Hertford Mercury and Reformer. 19 November 1864. Retrieved 15 August 2015 – via British Newspaper Archive.
- Three Rivers Museum
- Historic England. "Langleybury House (1173157)". National Heritage List for England. Retrieved 15 November 2017.
- "Domestic Disturbances: Crafting The Look Of The Little Stranger". focusfeatures.com. Retrieved 2018-08-29.
- Historic England. "Stables to Langleybury House (1100889)". National Heritage List for England. Retrieved 15 November 2017.
- Maddrell, Avril M. C. (2004). "'Marcks, Violet Olivia Cressy- (1895–1970)'". Oxford Dictionary of National Biography. Oxford: Oxford University Press. doi:10.1093/ref:odnb/57179. Retrieved 2009-03-09.
- Williamson, Tom & The Hertfordshire Gardens Trust The parks and Gardens of West Hertfordshire pub. The Hertfordshire Gardens Trust, 2000 ISBN 0-9538417-1-5
- I Remember Living at Langleybury House by Jill Tidmarsh, Abbots Langley Local History Society, 2000.