| Abbreviation | Definition |
|---|---|
| INI | International Needs, Inc. |
| INP | Institute for Nonprofit Practice |
| INQLABI | Improving Neighbourhood Quality of Life And Basic Infrastructure |
| INRC | International Nutrition Research Center |
| INRC | Larned A. Waterman Iowa Non-profit Resource Center |
| INRF | Idaho Natural Resource Foundation |
| INRF | Indiana Natural Resource Foundation |
| INRF | Institut National de la Recherche Forestiere |
| INRF | Integrated Neurological Rehabilitation Foundation |
| INRF | International Nutrition Research Foundation |
| INRH | Institut National de Recherche Halleutique (National Institute of Fisheries Research) |
| INRM | Institute of Natural Resources Management |
| INRN | Indiana Non-profit Resource Network |
| INRP | Institut National de Recherche Pedagogique |
| INRZFH | Institut National de la Recherche Zootechnique, Forestière, et Hydrobiologique (National Institute of Zootechnic, Forestry, and Hydrobiological Research) |
| INTERMACS | Interagency Registry for Mechanically Assisted Circulatory Support |
| INWA | International Nordic Walking Federation |
| IOCA | International Organization of Culture and Arts |
| IOCC | International Orthodox Christian Charities |
| IOCD | Institute Of Corporate Directors |