Sir George Reresby Sitwell, 4th Baronet (27 January 1860 – 9 July 1943) was a British antiquarian writer and Conservative politician who sat in the House of Commons between 1885 and 1895.

His collection of books and papers is said to have filled seven sitting-rooms at the family house, Renishaw Hall, in Derbyshire.

[3] In 1909 he purchased the Castle of Montegufoni [it; fr], in Montespertoli near Florence, then a wreck inhabited by three hundred peasants.

[4] Over the next three decades he restored it to its original design, commissioned the Italian painter Gino Severini to paint the murals,[5] and took up permanent residence there in 1925, writing to the Archbishop of Canterbury and the Chancellor of the Exchequer to explain that taxes had forced him to settle in Italy.

Together, they had three children:[4][7] Sitwell remained in Italy at the outbreak of the Second World War, but moved to Switzerland in 1942.