| Macmillan of Ovenden (Viscountcy) |
Maurice Harold Macmillan - Fri 24th Feb 1984
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| Macnaghten (Barony) |
Edward Macnaghten - Tue 25th Jan 1887
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17 February 1913 |
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| Macpherson of Drumochter (Barony) |
Thomas Macpherson - Thu 25th Jan 1951
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| Macpherson of Earl's Court (Barony) |
Nicholas Ian Macpherson - Tue 4th Oct 2016
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| Maddock (Barony) |
Diana Margaret Maddock - Thu 30th Oct 1997
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26 June 2020 |
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| of Madeley (Earldom) |
Robert Offley Ashburton Crewe-Milnes - Mon 3rd Jul 1911
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20 June 1945 |
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| Maelor (Barony) |
Thomas William Jones - Mon 13th Jun 1966
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18 November 1984 |
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| Maenan (Barony) |
William Francis Kyffin Taylor - Wed 23rd Jun 1948
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22 September 1951 |
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| Magan of Castletown (Barony) |
George Morgan Magan - Tue 25th Jan 2011
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| Magennis (Viscountcy) |
Arthur Magennis - Tue 18th Jul 1623
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| Magheramorne (Barony) |
James Macnaghten McGarel-Hogg - Tue 5th Jul 1887
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21 April 1957 |
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| Maginnis of Drumglass (Barony) |
Kenneth Wiggins Maginnis - Fri 20th Jul 2001
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| Maguire (Barony) |
Bryan Roe Maguire - Fri 3rd Mar 1628
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| Maidstone (Viscountcy) |
Elizabeth Finch - Sat 8th Jul 1623
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| Mair (Barony) |
Robert James Mair - Thu 29th Oct 2015
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| Mais (Barony) |
Alan Raymond Mais - Sat 26th Aug 1967
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28 November 1993 |
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| Maitland (Viscountcy) |
John Maitland - Thu 14th Mar 1624
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| Makgill of Cousland (Lordship) |
James Makgill - Wed 19th Apr 1651
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| Malcolm of Poltalloch (Barony) |
John Wingfield Malcolm - Tue 9th Jun 1896
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6 March 1902 |
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| Malden (Viscountcy) |
Arthur Capell - Wed 20th Apr 1661
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