William Kinwolmarsh (d. December 1422[1]) was a royal treasurer of England for about seven days, during 1422.
Kinwolmarsh was appointed as Provost of Beverley Minster during 1419,[2] followed by the position of Deputy Treasurer of England (1417–1421), and the royal household's Lord High Treasurer, a position that he held for only one week before his death.
[3][4] He had been appointed by the widowed Lucia, Countess of Kent as a deputy to regulate her dower.
[5] In the reign of Henry IV, Kinwolmarsh was Dean of St-Martin's le-Grand.
[6] He is noted as particularly active in fulfilling his duties as a royal councillor and administrator.