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NIR

NIR or Nir may refer to:

  • Near-infrared, a region of the infrared spectrum of light used for Near-infrared spectroscopy
  • Negros Island Region, one of the 18 regions of the Philippines
  • Northern Ireland, a region of the United Kingdom
  • Northern Ireland Railways
  • National Identity Register, a former UK database
  • National Internet registry, which coordinates IP address and other resource allocation
  • Rate of natural increase, a demographic metric of population increase
  • Nir, Iran (disambiguation)