| IMSO | Intensive Management Staff Officer 
| Others |
| IMSO | Interactive Music Simulation Organization
| Others |
| IMSO | International Mathematics and Science Olympiad
| Others |
| IMSO | International Military Student Office
| Others |
| IMSO | International Military Student Officer
| Others |
| IMSO | International Military Students Office
| Others |
| IMSO | International Mobile Satellite Organization
| Others |
| IMSO | International Multiple Sclerosis Organization
| Others |
| IMSO | Istics Military Student Office
| Others |