MMH may refer to:
- Monomethylhydrazine, a chemical with the formula CHNH.
- The IATA location identifier for Mammoth Yosemite Airport.
- The private hospital in Taipei, Taiwan, Mackay Memorial Hospital.
- The NYSE ticker symbol for Meristar Hotels and Resorts, now Interstate Hotels and Resorts.
- Abbreviation of a very popular Spanish word in systems engineering which means: "Movimiento Molecular Hypersonic"
- Multilinear Modular Hashing, a hash function computer algorithm
- Miguel de la Madrid Hurtado, 52nd President of Mexico.