| Moore (Viscountcy) |
Gerald Moore - Mon 7th Feb 1622
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- |
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| Mordaunt (Viscountcy) |
John Mordaunt - Thu 10th Jul 1659
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16 June 1814 |
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| Morpeth (Viscountcy) |
Charles Howard - Wed 20th Apr 1661
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- |
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| Mountbatten of Burma (Viscountcy) |
Louis Francis Albert Victor Nicholas Mountbatten - Fri 23rd Aug 1946
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- |
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| Mountcashell (Viscountcy) |
Paul Davis - Thu 21st Jan 1706
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30 July 1736 |
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| Mountcashell (Viscountcy) |
Stephen Moore - Wed 22nd Jan 1766
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1 April 1915 |
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| Mount Charles (Viscountcy) |
Henry Conyngham - Tue 21st Nov 1797
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- |
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| Mount Earl (Viscountcy) |
Valentine Richard Quin - Sat 3rd Feb 1816
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25 March 2011 |
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| Mount Edgcumbe and Valletort (Viscountcy) |
George Edgcumbe - Mon 5th Mar 1781
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- |
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| Mountgarret (Viscountcy) |
Richard Butler - Thu 23rd Oct 1550
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- |
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| Mountjoy (Viscountcy) |
William Stewart - Fri 19th Mar 1683
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14 August 1769 |
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| Mountjoy (Viscountcy) |
Luke Gardiner - Wed 30th Sep 1795
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25 May 1829 |
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| Mountjoy (Viscountcy) |
John Stuart - Tue 1st Mar 1796
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- |
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| Mountmorres (Viscountcy) |
Hervey Morres - Wed 29th Jun 1763
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- |
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| Muirshiel (Viscountcy) |
John Scott Maclay - Thu 16th Jul 1964
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17 August 1992 |
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| Muskerry (Viscountcy) |
Charles MacCarthy - Wed 15th Nov 1628
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11 May 1691 |
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| Nelson (Viscountcy) |
Horatio Nelson - Fri 22nd May 1801
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21 October 1805 |
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| Netterville (Viscountcy) |
Nicholas Netterville - Sun 3rd Apr 1622
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7 April 1882 |
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| Nevill (Viscountcy) |
George Nevill - Mon 17th May 1784
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- |
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| Newark (Viscountcy) |
Robert Pierrepont - Tue 29th Jun 1627
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23 September 1773 |
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