| IOOC | Insight Out of Chaos 
| Others |
| IOOC | Interagency Ocean Observation Committee
| Others |
| IOOC | International Conference on Integrated Optics & Optical Fiber Communication
| Others |
| IOOC | International Conference on Integrated Optics and Optical Fibre Communication
| Others |
| IOOC | International Olive Oil Council
| Others |
| IOOC | Iranian Offshore Oil Company
| Others |