Sir John Alan (also spelled Alen or Alleyn; c. 1500 – 1561) was a leading English-born statesman in sixteenth century Ireland. He was a member of the Irish House of Commons, and held the offices of Master of the Rolls in Ireland, Chancellor of the Exchequer of Ireland and Lord Chancellor of Ireland. Though he was childless himself, one of his brothers, William, founded a prominent landowning dynasty in County Kildare. The family's holdings included lands at Celbridge, St. Wolstan's and Kilteel, County Kildare, as well as substantial lands in County Dublin. They also acquired a baronetcy.