The elder son of Sir Sacheverell Sitwell, 6th Baronet, he was educated at Sandroyd School then 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 the baronetcy by George Sitwell, the son of his brother Francis, who died in 2004, and his sister-in-law Susanna Cross. Due to Sir Reresby and his brother being "never in harmony", he bequeathed Renishaw Hall to his daughter (and only child) Alexandra, Mrs Rick Hayward.
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 Renishaw Hall.
- Sir Reresby Sitwell, Bt, Daily Telegraph, 31 March 2009. Retrieved 2 April 2009
- Francis Sitwell Daily Telegraph, 22 January 2004. Retrieved 30 April 2013
- "Sir Reresby Sitwell, Bt". The Telegraph. 31 March 2009. Retrieved 4 October 2013.
- Sir Reresby Sitwell, Bt, Timesonline. Retrieved 1 April 2009
- "No. 49294". The London Gazette. 18 March 1983. p. 3829.
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