| Many a good cow has a bad calf |
| Many a good father has but a bad son |
| Many a little makes a mickle |
| Many a true word is spoken in jest |
| Many hands make light work |
| Many men, many minds |
| Many words hurt more than swords |
| Many words will not fill a bushel |
| Marriages are made in heaven |
| Measure for measure |
| Measure thrice and cut once |
| Men may meet but mountains never |
| Mend or end (end or mend) |
| Might goes before right |
| Misfortunes never come alone (singly) |
| Misfortunes tell us what fortune is |
| Money begets money |
| Money has no smell |
| Money is a good servant but a bad master |
| Money often unmakes the men who make it |
| Money spent on the brain is never spent in vain |
| More haste, less speed |
| Much ado about nothing |
| Much will have more |
| Muck and money go together |
| Murder will out |
| My house is my castle |
| Name not a rope in his house that was hanged |
| Necessity is the mother of invention |
| Necessity knows no law |
| Neck or nothing |
| Need makes the old wife trot |
| Needs must when the devil drives |
| Neither fish nor flesh |
| Neither here nor there |
| Neither rhyme nor reason |
| Never cackle till your egg is laid |
| Never cast dirt into that fountain of which you have sometime drunk |
| Never do things by halves |
| Never fry a fish till it's caught |
