- Maclaurin trisectrix
- MAC method
- macro-econometric model
- macroscopic level analysis
- MacWilliams theorem
- MAC法
- Magellanic clouds
- magic graph
- magic labeling
- magic product
- magic square
- magic square
- magic square
- magic square for addition and multiplication
- magic sum
- magnetic azimuth
- magnetic declination
- magnetic disk memory
- magnetic meridian
- magnetic meridian plane
- magnetic needle
- magnetic north
- magnetic tape memory
- magnetohydrodynamic turbulence
- magnetosonic wave