Cornelius O'Callaghan (1712 – 1781) was an Irish politician.
O'Callaghan served in the Irish House of Commons as the Member of Parliament for Fethard, Tipperary between 1761 and 1768.E. M. Johnston-Liik, MPs in Dublin: Companion to History of the Irish Parliament, 1692-1800 (Ulster Historical Foundation, 2006), p.54 (Retrieved 1 June 2016). He then represented Newtownards from 1775 to 1776.E. M. Johnston-Liik, MPs in Dublin: Companion to History of the Irish Parliament, 1692-1800 (Ulster Historical Foundation, 2006), p.54 (Retrieved 1 June 2016).
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