| Macartney (Earldom) |
George Macartney - Sat 1st Mar 1794
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| Macartney (Barony) |
George Macartney - Fri 19th Jul 1776
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| Macartney (Viscountcy) |
George Macartney - Thu 19th Jul 1792
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| Macdonald (Barony) |
Alexander Macdonald - Thu 25th Jul 1776
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| Macduff (Viscountcy) |
William Duff - Thu 26th Apr 1759
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29 January 1912 |
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| Magennis (Viscountcy) |
Arthur Magennis - Tue 18th Jul 1623
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| Maguire (Barony) |
Bryan Roe Maguire - Fri 3rd Mar 1628
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| Malton (Barony) |
Charles Watson-Wentworth - Thu 17th Dec 1750
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| of Malton (Earldom) |
Charles Watson-Wentworth - Thu 17th Dec 1750
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| of Massereene (Earldom) |
Clotworthy Skeffington - Fri 16th Jul 1756
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25 February 1816 |
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| Massereene (Viscountcy) |
John Clotworthy - Sun 21st Nov 1660
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| Massy (Barony) |
Hugh Massy - Sun 4th Aug 1776
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| Maule (Viscountcy) |
William Maule - Thu 2nd May 1743
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| Maynard (Barony) |
William Maynard - Sat 30th May 1620
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| Mayo (Viscountcy) |
John Bourke - Sat 13th Jan 1781
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| Mayo (Viscountcy) |
Theobald Bourke - Mon 21st Jun 1627
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| of Mayo (Earldom) |
John Bourke - Fri 24th Jun 1785
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| of Meath (Earldom) |
William Brabazon - Fri 16th Apr 1627
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| Melbourne (Viscountcy) |
Peniston Lamb - Thu 11th Jan 1781
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| Melbourne (Barony) |
Peniston Lamb - Thu 28th Jun 1770
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