The elder son of Sir Sacheverell Sitwell, 6th Baronet, he was educated at Eton College and King's College, Cambridge, but left the latter of his own volition without a degree. He married Penelope Forbes, the niece of Bernard Forbes, 8th Earl of Granard, in 1952. He was succeeded in his baronetcy by George Sitwell, a nephew, the son of his brother, Francis, who died in 2004. The house and estate were willed to his only child, Alexandra.
He was the nephew of poet and critic Dame Edith Sitwell. During his lifetime, Sitwell wrote a new variation upon the Robin Hood tale, was a partner in a wine business with Bruce Shand, and became known for his support of the arts and the upkeep of the family seat of Renishaw.
- Sir Reresby Sitwell, Bt, Daily Telegraph, 31 March 2009. Retrieved 2 April 2009
- Francis Sitwell Daily Telegraph, 22 January 2004. Retrieved 30 April 2013
- Bizarre exhibition at the spiritual home of British eccentricity by Robert Hardman, Daily Mail, 2 June 2007
- Sir Reresby Sitwell, Bt, Timesonline. Retrieved 1 April 2009
- "No. 49294". The London Gazette. 18 March 1983. p. 3829.
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