John Fitzadam (died c.1419) was an Irish judge of the late fourteenth and early fifteenth century. He is notable for his very long tenure as Chief Justice of the Irish Common Pleas; he held the office for twenty-three years, in the reigns of three English Kings.[1] Some years after his death, he was accused of judicial misconduct, in that he had unduly favoured one party in a lawsuit, but it is impossible now to determine the truth of the matter.[2]