| IMSS | Immigrant and Multicultural Services Society 
| Others |
| IMSS | Improved Modular Sleeping System
| Others |
| IMSS | Information Management System for Scholars
| Others |
| IMSS | Institut Municipal de Serveis Socials
| Others |
| IMSS | Institute of Materials Structure Science
| Others |
| IMSS | Instituto Mexicano de Seguro Social
| Others |
| IMSS | Instituto Mexicano del Seguro Social
| Others |
| IMSS | Instrumental Music School Services
| Others |
| IMSS | Integrated Management Safety Standards
| Others |
| IMSS | Integrated Mapping Surveillance System
| Others |
| IMSS | Integrated Maritime Surveillance Systems
| Others |
| IMSS | Integrated Market Security System
| Others |
| IMSS | Integrated Middle School Science
| Others |
| IMSS | Integrating Middle School Science
| Others |
| IMSS | Inter-Movement Support System
| Others |
| IMSS | International Marketing Support Scheme
| Others |
| IMSS | International Mass Spectrometry School
| Others |
| IMSS | International Mass Spectrometry Society
| Others |
| IMSS | International Medical Students Society
| Others |
| IMSS | International Medical Support Services
| Others |
| IMSS | International Motor Sports Show
| Others |
| IMSS | International Motorsports Sim Series
| Others |
| IMSS | International Museum of Surgical Science
| Others |
| IMSS | Internet and Management Support for Storage
| Others |
| IMSS | Interscan Messaging Security Suite
| Others |
| IMSS | Irish Mass Spectrometry Society
| Others |
| IMSS | Italtel Multi Service Solutions
| Others |