| Abbreviation | Definition |
|---|---|
| IBRD | International Bank for Reconstruction and Development |
| ICAP | Illness Costs Of Air Pollution |
| ICAST | International Center for Appropriate and Sustainable Technology |
| ICAT | Innovative Clean Air Technologies |
| ICCT | Innovative Clean Coal Technology |
| ICCTF | Indonesia Climate Change Trust Fund |
| ICDP | Integrated Conservation and Development Project |
| ICE | Innovation, Conservation, and Efficiency |
| ICEA | International Center for Environmental Arts |
| ICEAE | International Conference on Environmental and Agriculture Engineering |
| ICEF | International Conferences on Environmental Future |
| ICEP | International Conference of Environmental Psychology |
| iCET | Innovation Center For Energy and Transportation |
| ICPDR | The International Commission for the Protection of the Danube River |
| ICRU | Icelandic Crisis Response Unit |
| ICRW | International Convention for the Regulation of Whaling |
| ICSC | International Civil Service Commission |
| ICSW | International Conference on Solid Waste Technology and Management |
| ICSZ | International Congress on Soil Zoology and Ecology |
| ICWG | Interagency Conservation Working Group |