NIR

NIR or Nir may refer to:

Science and technology

 * Near-infrared, a region within the infrared part of the electromagnetic radiation spectrum
 * Near-infrared spectroscopy, a spectroscopic method that uses the near-infrared region (from 780 nm to 2500 nm).
 * National Identity Register, a former UK database
 * National Internet registry, which coordinates IP address and other resource allocation
 * NIR, proposed variation of the SECAM colour television system in the Soviet Union
 * Numéro d'inscription au répertoire national d'identification des personnes and numéro d'inscription au répertoire, national identity numbers; see INSEE code

Places

 * Nir, Iran (disambiguation), several places in Iran
 * Negros Island Region, one of the 18 regions of the Philippines
 * Nigeria, UNDP country code
 * Northern Ireland (FIFA country code: NIR, ISO 3166 code: GB-NIR), a part of the United Kingdom
 * Ness Islands Railway, a miniature railway in Scotland

Other uses

 * Nir (name), a Hebrew given name and surname
 * Northern Ireland Railways, the railway operator in Northern Ireland
 * Rate of natural increase, a demographic metric of population increase