John Bermyngham

John Bermyngham or Bermingham (died 1415) was an Irish barrister and judge. He was one of the first Crown Law officers to be referred to as the King's Serjeant. He was later appointed Lord Chief Justice of Ireland, but did not take up the office.

He belonged to the prominent Anglo-Irish Bermingham dynasty, which acquired the titles Earl of Louth and Baron Athenry. In 1248 the Crown granted to Peter Bermingham and his heirs the lands at Esker, Lucan, Dublin to hold as tenant in chief. He and his heirs were required to perform knight-service in return. He was chosen as Chief Justice in 1407 but he cannot have taken up office, since Stephen de Bray, appointed in 1403, remained Chief Justice until 1426. The two judges sat together the same year on an inquisition, requested by the Abbot of St. Mary's Abbey, Dublin to determine the boundaries of the township of Kilternan, which was the Abbey's property. John died in 1415.

He was probably the grandfather of Philip Bermingham (died 1490), Lord Chief Justice of Ireland. Richard Bermingham, who was appointed second Baron of the Court of Exchequer (Ireland) in 1420, may also have been a relative.