M
| Title | Date of creation | Surname | Current status | Notes |
|---|---|---|---|---|
| Macartney of Nish | 1799 | Macartney | extant | |
| Macdonnell of Maye | 1627 | Macdonnell | forfeit 1691 | |
| MacMahon of Clondirrala | 1628 | MacMahon | extinct c. 1680 | |
| Magill of Gill Hall | 1680 | Magill | extinct 1700 | |
| Magrath of Allevolan | 1629 | Magrath | extinct c. 1670 | |
| Mannix of Richmond | 1787 | Mannix | extinct 1822 | |
| Loftus of Loftus Hall | 1780 | Tottenham, Loftus | extant | |
| Massy of Donass | 1782 | Massy | extinct 1870 | |
| Maude of Dondrum | 1705 | Maude | dormant | third Baronet created Viscount Hawarden in 1791; Baronetcy dormant (10th Baronet died 1991) - under review |
| May of Mayfield | 1763 | May | extinct 1834 | |
| Meade of Meadstown | 1703 | Mead | extant | fourth Baronet created Earl Clanwilliam in 1776 |
| Meredyth of Carlanstown | 1795 | Meredyth | extinct 1923 | |
| Meredyth of Greenhills | 1660 | Hamilton | extinct 1904 | |
| Miller of Glenlee | 1788 | Miller | extant | |
| Molyneux of Castle Dillon | 1730 | Molyneux | extinct 1940 | |
| Moore of Ross | 1681 | Moore | extant | |
| Morres of Castlemorres | 1631 | Morres, de Montmonrency | extant | |
| Mullins of Ventry | 1797 | Mullins, de Moleyns, Eveligh-de-Moleyns | extant | first Baronet created Baron Ventry in 1800 |
| Musgrave of Tourin | 1782 | Musgrave | extant |
Read more about this topic: List Of Baronetcies In The Baronetage Of Ireland