| Abbreviation | Definition |
|---|---|
| IBCM | International Bathymetric Chart of the Mediterranean and its Geological/Geophysical Series |
| IBCRSGA | International Bathymetric Chart of the Red Sea and Gulf of Aden |
| IBCWIO | International Bathymetric Chart of the Western Indian Ocean |
| IBCWP | International Bathymetric Chart of the Western Pacific |
| IBFLW | Incident Breakpoint Forced Long Wave |
| IBLW | Incident Bound Long Wave |
| IBM | Individual- Based Model |
| IBM | Individual-Based Model |
| IBM | Instituto de Biologia Marina |
| IBM | Instituto de Biologia Marina, San Antonio |
| IBP | International Biological Program |
| IBRD | International Bank for Reconstruction and Development |
| IBSFC | International Baltic Sea Fishery Commission |
| IBT | Inter Basin Transfer |
| ICACGP | International Commission on Atmospheric Chemistry and Global Pollution |
| ICAM | Integrated Coastal And Marine |
| ICAM | Integrated Coastal Area Management |
| ICAMR | Interdepartmental Committee for Applied Meteorological Research |
| ICAS | Interdepartmental Committee for Atmospheric Sciences |
| ICB | Information Collection Budget |