Sir Patrick Barnewall or Barnwall (died 1622), was the eldest son of Sir Christopher Barnewall of Turvey, Grace Dieu Abbey, and Fieldston. Christopher in turn was the son of the elder Sir Patrick Barnewall, who in 1534 was made Serjeant-at-law (Ireland) and Solicitor-General for Ireland, and in 1550 became Master of the Rolls in Ireland. Patrick's mother was Marion Sherle, daughter of Richard Sherle of Shallon, County Meath: after his father's death she remarried the prominent judge Sir Lucas Dillon. She died in 1607.