What is "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)