| Name | Club | E1 | Pld | New | +/- |
|---|---|---|---|---|---|
| Mike Maguire | Pentyrch | 1658 | 6 | 1670 | +12 |
| Dave Mahoney | Barry | 1340 | 12 | 1408 | +68 |
| Tom Martin | North Cardiff | 1070 | 6 | 1106 | +36 |
| Viv Martin | Pentyrch | 1627 | 4 | 1624 | -3 |
| Jack Mason | Cardiff | 1043 | 0 | 1043 | 0 |
| Ken Mason | Pontypridd | 1502 | 3 | 1494 | -8 |
| Vicky Massey | Cardiff | 850 | 11 | 841 | -9 |
| Laurance Matuszezyk | Nelson | 1200 | 1 | 1197 | -3 |
| John McGregor | Pentyrch | 1886 | 7 | 1896 | +10 |
| Joshua McKenna | Cardiff | 1392 | 14 | 1322 | -70 |
| Mike McLoughlin | Pentyrch | 1177 | 6 | 1151 | -26 |
| Lewis Medcraft | Cardiff | 978 | 1 | 966 | -12 |
| Alex Menzies | Cardiff | 1028 | 0 | 1028 | 0 |
| Nithin Michael | St John's College | 850 | 1 | 850 | 0 |
| Brenda Miles | Nelson | 1388 | 4 | 1379 | -9 |
| Phil Mitchell | Pontypridd | 1206 | 0 | 1206 | 0 |
| Gareth Morgan | Barry | 1439 | 0 | 1439 | 0 |
| Hugh Morgan | Caerphilly | 1693 | 3 | 1702 | +9 |
| Richard Morgan | Pentyrch | 1373 | 3 | 1332 | -41 |
| Tahlia Morgan-Rose | Cardiff | 850 | 0 | 850 | 0 |
| Justin Morgans | Caerphilly | 1650 | 10 | 1592 | -58 |
| Gwilym Moses | Bridgend | 1097 | 3 | 1106 | +9 |
| Stuart Mustoe | Bridgend | 1125 | 0 | 1125 | 0 |
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