| Maitland (Viscountcy) |
John Maitland - Thu 26th May 1672
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24 August 1682 |
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| Maitland (Viscountcy) |
John Maitland - Thu 14th Mar 1624
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- |
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| Malden (Viscountcy) |
Arthur Capell - Wed 20th Apr 1661
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- |
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| Malpas (Viscountcy) |
Hugh Cholmondeley - Mon 27th Dec 1706
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- |
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| Malvern (Viscountcy) |
Godfrey Martin Huggins - Fri 18th Mar 1955
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- |
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| Mandeville (Viscountcy) |
Henry Montagu - Sat 19th Dec 1620
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- |
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| Mansfield (Viscountcy) |
William Cavendish - Tue 3rd Nov 1620
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26 July 1691 |
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| Marchwood (Viscountcy) |
Frederick George Penny - Thu 13th Sep 1945
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- |
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| Margesson (Viscountcy) |
Henry David Margesson - Mon 27th Apr 1942
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- |
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| Marsham (Viscountcy) |
Charles Marsham - Mon 22nd Jun 1801
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- |
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| Massereene (Viscountcy) |
John Clotworthy - Sun 21st Nov 1660
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- |
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| Maugham (Viscountcy) |
Frederic Herbert Maugham - Fri 22nd Sep 1939
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13 March 1981 |
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| Maule (Viscountcy) |
William Maule - Thu 2nd May 1743
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4 January 1782 |
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| Maynard (Viscountcy) |
Charles Maynard - Tue 28th Oct 1766
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19 May 1865 |
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| Mayo (Viscountcy) |
Theobald Bourke - Mon 21st Jun 1627
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12 January 1767 |
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| Mayo (Viscountcy) |
John Bourke - Sat 13th Jan 1781
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- |
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| Melbourne (Viscountcy) |
Peniston Lamb - Thu 11th Jan 1781
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29 January 1853 |
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| Melgund (Viscountcy) |
Gilbert Elliot Murray Kynynmound - Wed 24th Feb 1813
|
- |
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| Melville (Viscountcy) |
Henry Dundas - Fri 24th Dec 1802
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- |
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| Mentmore (Viscountcy) |
Archibald Philip Primrose - Mon 3rd Jul 1911
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- |
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