George Sidney Roberts Kitson Clark (1900–1975) was an English historian, specialising in the nineteenth century.
He is known as a revisionist historian of the Repeal of the Corn Laws.G. D. H. Cole identified a "Kitson Clark" school of historians revising the assessment of the Anti-Corn Law League and the Chartists.
He was educated at Shrewsbury School and Trinity College, Cambridge. He lived the life of a bachelor don as Fellow of Trinity, from 1922 to 1975. He was Reader in Constitutional History from 1954 to 1967.
Jack Plumb, who disliked Kitson Clark, describes him as a reformer of the History Tripos, and obstacle to Lewis Namier, with various swipes .
He was the son of the engineer Edwin Kitson Clark, and brother of Mary Kitson Clark.