St John O'Neill (6 May 1741[1][2]–March 1790[2][3]) represented Randalstown in the Irish House of Commons from 1771 to 1776.[1] and was High Sheriff of Antrim in 1774.[4] He was returned unopposed[5] at a by-election for Randalstown occasioned by the death of his father Charles O'NeillofShane's Castle.[6] Randalstown was a pocket borough of his family[5] and its other MP was his elder brother John O'Neill, later 1st Viscount O'Neill.[3][7]
St John O'Neill married a Miss Borrowes and they had one daughter, who died unmarried.[n 1] 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,[10] and a church organ to the Catholic chapel near by at Aughnahoy.[11]
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