HMM may refer to:

  • Central Mashan Miao (ISO 639 code: hmm), a variety of the Mashan Miao language
  • Hammerton railway station, England, National Rail station code HMM
  • Hatch Mott MacDonald, a North American engineering consulting firm
  • Heavy meromyosin, a fragment obtained from the muscle protein myosin II following limited proteolysis
  • Heavy metal music, a subgenre of rock music
  • Heroes of Might and Magic (more often referred to as HoMM), a series of turn-based strategy games by New World Computing
  • Hidden Markov model, a statistical model
  • High-end Master Model, a high-quality Zoids model kit
  • Homenmen, an Armenian sporting organization
  • Houston Maharashtra Mandal, a Maharashtra Mandal in Houston, Texas
  • Hum (sound), a sound one makes when thinking, e.g. "Hmm, I wonder..."
  • Human malignant melanoma, a tumour of melanocytic origin
  • Hyundai Merchant Marine, a South Korean logistics company
  • Marine Medium Helicopter Squadrons, United States Marine Corps squadrons that fly the CH-46 Sea Knight helicopter

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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