NM, nm, nM, or Nm are common abbreviations for various terms.

nm may stand for:

  • nanometer, an SI unit of length, equal to 10−9 m (a billionth of a meter)
  • nm (Unix), a computer program used as an aid for debugging
  • "Never mind" or "nothing much" in common Internet slang

NM may stand for:

  • Nausena Medal (Navy Medal) is a gallantry award for servicemen in the Indian Navy.
  • New Mexico, one of the United States of America
  • National Monument and, in particular, National Monument (United States)
  • Nautical mile (NM or nmi), a unit of length used for maritime and aviation purposes
  • the IATA airline designator for Air Madrid, Mount Cook Airline, and Manx2

nM may stand for:

  • Nanomolar, a thousand-millionth of a molar

Nm may stand for:

  • Newton metre (may also be written as N·m), a unit of torque

°NM may stand for:

  • Normalizovaný muštomer, a scale of must density used in the Czech Republic and Slovakia

Nm3 stands for:

  • normal cubic metre, a unit of volume (Normal in this context means at standard temperature and pressure)
  • "newton cubic metres" in SI notation