- muidAn old French liquid measure of approximately 274.2 litres.
- modiusA Roman dry measure of about a peck or 9 litres.
- moioA traditional Portuguese dry measure, equal to about 0.78–1.15 m³ at different places and times.
- mutchkinA unit of fluid capacity approximately equal to three-quarters of an imperial pint (0.43 litres)