| Muskerry (Barony) |
Robert Tilson Deane - Fri 5th Jan 1781
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| Naas (Barony) |
John Bourke - Thu 1st Aug 1776
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- |
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| Netterville (Viscountcy) |
Nicholas Netterville - Sun 3rd Apr 1622
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| Newborough (Barony) |
George Cholmondeley - Fri 12th Apr 1715
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| Newborough (Barony) |
Thomas Wynn - Tue 23rd Jul 1776
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| Newcomen (Barony) |
Charlotte Gleadowe-Newcomen - Thu 31st Jul 1800
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15 January 1825 |
- |
| Newhaven (Barony) |
William Mayne - Fri 26th Jul 1776
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28 May 1794 |
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| Newport (Barony) |
Robert Jocelyn - Fri 29th Nov 1743
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| Newtown Butler (Barony) |
Theophilus Butler - Mon 21st Oct 1715
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21 December 1998 |
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| Norbury (Barony) |
John Toler - Mon 22nd Dec 1800
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| Norwood (Barony) |
Grace Toler - Fri 24th Nov 1797
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| Nugent (Barony) |
Mary Elizabeth Nugent-Temple-Grenville - Fri 26th Dec 1800
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26 November 1850 |
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| Ogle (Viscountcy) |
William Ogle - Sat 23rd Dec 1645
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| O'Neill (Barony) |
John O'Neill - Fri 25th Oct 1793
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12 February 1855 |
- |
| Ongley (Barony) |
Robert Henley Ongley - Tue 30th Jul 1776
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21 January 1877 |
- |
| Oranmore and Browne (Barony) |
Dominick Browne - Wed 4th May 1836
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- |
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| Oriel (Barony) |
Margaretta Amelia Foster - Sat 5th Jun 1790
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| Orwell (Barony) |
Francis Vernon - Wed 7th Apr 1762
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15 October 1783 |
- |
| of Ossory (Earldom) |
Piers Butler - Sun 23rd Feb 1528
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| Oxmantown (Barony) |
Laurence Harman Harman - Sat 22nd Sep 1792
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