- J. E. W. Addison, British judge and Conservative politician
- Ernest Alton, independent Unionist politician in the House of Commons of Southern Ireland and in Seanad Éireann
- Hugh Annesley, 5th Earl Annesley, M.P. for Cavan, later an Irish representative peer in the House of Lords
- Thekla Beere, Civil Servant and chairwoman of the ILO
- John Beresford, Irish statesman
- Harman Blennerhassett, Irish-American supporter of the Burr conspiracy
- Frederick Boland, Irish diplomat and twenty-first Chancellor of the University
- Edmund Burke, philosopher, political theorist, statesman and MP for the British Whig Party
- Hugh Cairns, 1st Earl Cairns, Lord Chancellor of Great Britain and Chancellor of the University of Dublin
- Dara Calleary, Fianna Fáil politician
- Sir Edward Carson, leader of the Irish Unionists
- Lucinda Creighton, Fine Gael politician
- Richard Curran, National Centre Party and later Fine Gael TD
- Sir Colville Deverell, Governor of the Windward Islands and Mauritius
- Paschal Donohoe, Fine Gael TD
- Robert Emmet, Irish nationalist
- Henry Grattan, member of the Irish House of Commons
- Mary Harney, Irish politician, former leader of the PDs and former Tánaiste
- Sean Haughey, Irish politician
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- Douglas Hyde, first President of Ireland
- Brian Lenihan, Irish politician, former Minister for Finance
- George Macartney, British statesman (1st Earl Macartney)
- Mairead Maguire(Irish School of Ecumenics), a peace activist, winner of the Nobel Peace Prize in 1976.
- Mary McAleese, 8th President of Ireland
- Mary Lou McDonald, vice president of Sinn Féin and TD
- Richard Graves MacDonnell, Governor of South Australia, Lieutenant-Governor of Nova Scotia and Governor of Hong Kong
- Leonard Greenham Star Molloy, surgeon and politician
- Conor Cruise O'Brien, Irish politician, writer and academic
- John O'Connell, member of parliament, leader of the Repeal Association
- Liz O'Donnell, Irish politician and Minister for Overseas Development
- Emily O'Reilly, former journalist, author and Ombudsman
- William Hoey Kearney Redmond, Nationalist politician and First World War fatality
- Mary Robinson, former President of Ireland
- Henry Westenra, 3rd Baron Rossmore, politician and piper
- Sir Malcolm Stevenson, Governor of Cyprus and of the Seychelles
- James Stopford, 2nd Earl of Courtown, Tory politician
- Leo Varadkar, Fine Gael politician
- Jaja Wachuku First Nigerian Foreign Affairs Minister.
- Theobald Wolfe Tone, father of Irish republicans
- Thomas Wyse, politician and diplomat
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