| Abbreviation | Definition |
|---|---|
| IMO | In My Opinion |
| INCCA | International Network for the Conservation of Contemporary Art |
| IOW | In Other Word |
| IPCA | Indigenous Protected and Conserved Area |
| IPCA | Indo Pacific Conservation Alliance |
| IRCAD | Integrated Regional Conservation And Development |
| IRCF | International Reptile Conservation Foundation |
| IRCP | Idaho Rangeland Conservation Partnership |
| ISBI | Iron Sharpened By Iron |
| ISCO | International Soil Conservation Organization |
| ISCP | Indonesia Species Conservation Program |
| ITFC | Institute of Tropical Forest Conservation |
| IUCN | Indian Union for Conservation of Nature |
| IUCN | International Union for Conservation Network |
| IUCN | International Union for Conservation of Nature and Natural Resources |
| JAIC | Journal of the American Institute for Conservation |
| JDCF | Jo Daviess Conservation Foundation |
| KBA | Key Biodiversity Area |
| KCCA | Kettle Creek Conservation Authority |
| KCCL | Kent County Conservation League |