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Sir John Knyvet (1394/95–1445), of Southwick, Northamptonshire, Hamerton, Huntingdonshire and Mendlesham, Suffolk, was an English MP. In December 1421, he was a Member of Parliament for Northamptonshire. He was the son and heir of John Knyvet (1358/9–1418) by his first wife Joan Boutetout (d.c.1417), daughter and heiress of Sir John Boutetout (d. by 1377) of Mendlesham by his wife Katherine. He had been knighted by December 1418.