|Founder||Geoffrey Davison Brown|
|Local authority||West Sussex|
|Houses||Clives, Drakes, Haigs, Scotts|
|Colours||Blue and pink|
Cottesmore is a preparatory school in the United Kingdom, which has been preparing children for public schools since 1894. It is predominantly full boarding and there are 175 boys and girls from the ages of 7 to 13.
Cottesmore is situated in 35 acres (140,000 m2) of its own grounds, the setting for its playing fields, cricket pitches, two astroturf fields, all-weather cricket nets, grass and hard tennis courts, golf course, 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.
The school was the winner of the Best School Food Award Tatler Schools Awards in 2009.
- Gordon Chater, actor and comedian
- Captain Rowley Gregg MC, decorated army officer
- Robert Hanbury Brown, astronomer
- Robin Niblett, director of Chatham House
- Doug Scott (teacher), mountaineer, first Briton to climb Mount Everest
- Thomas Sopwith, aviation pioneer
- Hugo Southwell, rugby union footballer, Scotland
- Luke Wallace, rugby union footballer, Harlequins F.C.
- 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.
- English Heritage listing
- 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
- Main building to Cottesmore School. Listing on English Heritage's Images of England website
- End of school dinners. The Evening Standard, (London, England), Tuesday, September 15, 2009
- The Almost Late Gordon Chater, Bantam Books, 1996, ISBN 9781863597975
- Cottesmore School, Educated School Guide
- The Encyclopædia Britannica, 20, 1929