St John O'Neill

St John O'Neill (6 May 1741 –March 1790  ) represented Randalstown in the Irish House of Commons from 1771 to 1776. and was High Sheriff of Antrim in 1774. He was returned unopposed at a by-election for Randalstown occasioned by the death of his father Charles O'Neill of Shane's Castle. Randalstown was a pocket borough of his family and its other MP was his elder brother John O'Neill, later 1st Viscount O'Neill.

St John O'Neill married a Miss Borrowes and they had one daughter, who died unmarried. He resided at Portglenone Castle, and donated a copper collecting-ladle to the Portglenone chapel of ease of the Church of Ireland parish of Ahoghill, and a church organ to the Catholic chapel near by at Aughnahoy.