| IMASS | Industrial Medical And Safety Services 
| Others |
| IMASS | Institute of Materials And Systems for Sustainability
| Others |
| IMASS | Integrated Methods in Archaeological Settlement Studies
| Others |
| IMASS | Integrated Multiple Access Switched Services
| Others |
| IMASS | Integrated Multiplex Assay and Sampling System
| Others |
| IMASS | International Military Adolescence Super Syndicate
| Others |
| IMASS | International Mortality And Smoking Statistics
| Others |