| IABO | Indiana Association of Building Officials 
| Others |
| IABO | Inter-collegiate Athletics Business Office
| Others |
| IABO | International African Bibliography Online
| Others |
| IABO | International Aristotle Bibliography Online
| Others |
| IABO | International Association for Biological Oceanography
| Others |
| IABO | International Association of Basketball Officials
| Others |
| IABO | Intra aortic balloon occlusion
| Others |
| IABO | Intra-Aortic Balloon Occlusion
| Others |
| IABO | Iowa Association of Building Officials
| Others |