| Acronym | Definition |
|---|
| IIN➣Institute for Integrative Nutrition (New York) |
| IIN➣Is It Normal |
| IIN➣Istituto Italiano di Navigazione (Italian: Italian Institute of Navigation) |
| IIN➣International Institute for Nanotechnology (est. 2000; Northwestern University; Ilinois) |
| IIN➣Instituto Interamericano del Niño (Inter-American Children's Institute) |
| IIN➣Intelligent Information Network |
| IIN➣Internet Intelligent Network |
| IIN➣Imagery Information Need |
| IIN➣Instituto de Investigacion Nutricional (Peru) |
| IIN➣Installation Instructions |
| IIN➣Intelligent Information Network (Cisco) |
| IIN➣Issuer Identification Number (credit cards) |
| IIN➣Impedance Inverter Network (microwave theory) |
| IIN➣Indigenous Information Network (Kenya) |
| IIN➣IBM Information Network |
| IIN➣International Identification Number |
| IIN➣Interferometric Intensity Noise |
| IIN➣Incidental Installation Material |