Simon Walker (24 January 1958 – 26 February 2004) was a British historian of late-medieval England.
Born in Kuala Lumpur, Malaysia, he was educated at Charterhouse School and Magdalen College, Oxford.
He was awarded a Prize Fellowship of All Souls College, Oxford where he completed his D.Phil thesis on John of Gaunt.
[1] Walker's work focused on late-medieval political history, more specifically on the relations between nobles and retainers within the framework often referred to as bastard feudalism.
His best-known work, The Lancastrian Affinity, 1361–1399 (1990), explored the retinue of John of Gaunt.