John Parnell

John Parnell (1680–1727) was an Irish politician and judge. He was the brother of the poet Thomas Parnell and ancestor of Charles Stewart Parnell. He was considered to be one of the less gifted members of a remarkable family.

He was born in Dublin, second son of Thomas Parnell (died 1685) of Portlaoise, originally from Congleton in Cheshire, and his wife Anne Grice (died 1709) of Kilosty, County Tipperary, whom he married in 1674. He went to school in Dublin and matriculated from Trinity College Dublin in 1694. He entered the Inner Temple in 1698 and was called to the Irish Bar in 1706. He became King's Counsel in 1715 and was appointed counsel to the Revenue Board. He was Recorder of Cashel and seneschal to William King, Archbishop of Dublin, who furthered his career; their correspondence still exists. He sat in the Irish House of Commons as member for Granard from 1713 to 1722, when he was appointed a judge of the Court of King's Bench (Ireland).

He married Mary Whitshed, sister of Chief Justice Whitshed, and had one son, Sir John Parnell, 1st Baronet. He had several distinguished descendants of whom the most famous is Charles Stewart Parnell. He inherited his brother Thomas's property on his death in 1718, as Thomas had outlived both his sons. They had one surviving sister, Margaret, who married into the prominent Burgh family of Bert House, County Kildare. He lived mainly at Rathleague, outside Portlaoise, and died there in 1727.