IJN

IJN may refer to:


 * International Justice Network, a human rights organization
 * Imperial Japanese Navy, the navy of Japan from 1868 until it was dissolved in 1945
 * IJN, a 1978 wargame about naval combat in the Pacific during World War II
 * Institut Jean Nicod, a French interdisciplinary research center
 * Institut Jantung Negara, National Heart Institute of Malaysia
 * Intermountain Jewish News, an international weekly newspaper publication located in Denver, Colorado