MMH may refer to:
- Monomethylhydrazine, CH<sub>3</sub>N<sub>2</sub>H<sub>3</sub>, a chemical
- Mammoth Yosemite Airport. IATA code
- Mackay Memorial Hospital, Taipei, Taiwan
- Multilinear Modular Hashing, a computer algorithm
- Manual material handling
- Mark McHugh, a Gaelic footballer
- Martin McHugh (Gaelic footballer), a Gaelic footballer