|Religious affiliation(s)||Church of England|
|Founder||Geoffrey Davison Brown|
|Department for Education URN||126106 Tables|
|Age||4 to 13|
|Houses||Clives, Drakes, Haigs, Scotts|
|Colour(s)||Blue and pink|
Cottesmore is an academic preparatory school in the United Kingdom, which has been preparing children for public schools since 1894. It is full boarding and there are 175 boys and girls from the ages of 4 to 13. Boarding starts at Year 4.
Cottesmore is surrounded by 1000 acres of forests and parkland (Pease Pottage Forest, Buchan Hill Forest and Cottesmore Golf and Country Club). The pupils can use 35 acres (140,000 m2) of its own grounds, the setting for its 9-hole golf course, playing fields, cricket pitches, two astroturf fields, all-weather cricket nets, grass and hard tennis courts, lake and gardens.
Cottesmore was founded by Geoffrey Davison Brown in 1894 in Hove, East Sussex. He named the school after Cottesmore, Rutland, where he was born. The new buildings for the preparatory school were officially opened on 19 June 1897.
The school moved to its present site at Pease Pottage after World War II in 1946. The school is housed in a fine, Grade II-listed Victorian mansion known as Buchan Hill that was built in 1882-3 by Philip Felix Renaud Saillard who had made his money from ostrich feathers. The building is a large Elizabethan-style house, designed by the architects Ernest George and Harold Peto. Buchan Hill had been purchased in the early 19th century by Hon. Thomas Erskine (Lord Chancellor 1806-1807), son of the Earl of Buchan.
Cottesmore is the winner of the "Boarding School of the Year" award at the TES Independent School Awards 2019. 
Cottesmore was nominated for the "Independent School of the Year" award at the TES Independent School Awards 2019.
Cottesmore has been given the Crystal Award 2019 for academic results by Best Schools 
At the School Notices ‘Best of the Best’ Awards 2019, Cottesmore was awarded “Social Media Savvy Awards” 
Cottesmore was named “Best of the Best” by The Week Independent Schools Guide 2019: “Best for Boarding”.
Cottesmore is the winner of “Best Country Boarding School 2019” and “Recognised Leaders in Digital Learning Experiences” at the CV Magazine Private Education & Development Awards 2019
Cottesmore is the winner of the "Boarding School of the Year" award at The iStudy Awards 2019. 
Cottesmore was "Highly Commended" at the Good Web Guide Awards 2019. 
Cottesmore was the winner of the "Best School Food Award" at the Tatler Schools Awards 2010.
Cottesmore was nominated for "Independent School of the Year", at the Independent School Parent Awards 2018.
Cottesmore was nominated for "Best Prep School" at the Good Schools Awards by Archant Life 2011.
- Gordon Chater, actor and comedian
- Robert Hanbury Brown, astronomer
- Robin Niblett, director of Chatham House
- Doug Scott (teacher), mountaineer, first Briton to climb Mount Everest[failed verification]
- Thomas Sopwith, aviation pioneer
- Hugo Southwell, rugby union footballer, Scotland[failed verification]
- Luke Wallace, rugby union footballer, Harlequins F.C.[failed verification]
- Margaret Smallwood (2008), Cottesmore School (PDF), Independent Schools Inspectorate
- The Morning Post (London, England), Monday, March 29, 1897; pg. 5; Issue 38941. 19th Century British Library Newspapers: Part II.
- Historic England. "Details from listed building database (1027012)". National Heritage List for England. Retrieved 11 May 2012.
- Mark Girouard (1971), The Victorian Country House, Clarendon Press, p. 8
- Jill Franklin (1981), The Gentleman's Country House and its Plan, 1835-1914, Routledge & Kegan Paul, p. 257
- Historic England. "Main building to Cottesmore School (1027012)". National Heritage List for England. Retrieved 11 May 2012.
- "Top School Awards". www.best-schools.co.uk. Retrieved 2019-06-08.
- "Best of the Best | School Notices Blog". 2019-05-28. Retrieved 2019-06-08.
- "The Week Independent Schools Guide". The Week UK. Retrieved 2019-06-08.
- End of school dinners. The Evening Standard, (London, England), Tuesday, September 15, 2009
- Parent, Independent School (25 September 2018). "Independent Schools of the Year 2018 Shortlist Announced - Independent School Parent".
- The Almost Late Gordon Chater, Bantam Books, 1996, ISBN 9781863597975
- Cottesmore School, Educated School Guide
- The Encyclopædia Britannica, 20, 1929