IGR

IGR may refer to:


 * Iguazu International Airport serving Puerto Iguazú and the nearby falls
 * IGR Iwate Ginga Railway in Iwate Prefecture, Japan
 * Imperial Japanese Government Railways (or, domestically, Imperial Government Railways) of early 20th century Japan
 * Indiana Guard Reserve, the state defense force of Indiana
 * International Gay Rugby
 * Insect growth regulator, a chemical that disrupts the growth and/or development of insects
 * The Interessengemeinschaft für Rundfunkschutzrechte (IGR), a broadcasting "IP" rights interest group
 * IGR Stereo, a German standard for analogue TV stereo audio transmission claimed by the above organization.
 * Intergenic region
 * Integral Gamma-Ray source, a catalog based on observations by the INTEGRAL telescope