| Acronym | Definition |
|---|
| IMSS | Instituto Mexicano del Seguro Social (Spanish: Mexican Social Security Institute) |
| IMSS | Istituto e Museo di Storia della Scienza (Italian) |
| IMSS | InterScan Messaging Security Suite |
| IMSS | International Museum of Surgical Science |
| IMSS | International Mass Spectrometry Society |
| IMSS | Internet and Management Support for Storage |
| IMSS | Institute of Materials Structure Science (Japan) |
| IMSS | Immigrant and Multicultural Services Society (Prince George, British Columbia, Canada) |
| IMSS | Independence Marketing Systems and Solutions (software) |
| IMSS | Irish Mass Spectrometry Society |
| IMSS | Information Management Systems & Services |
| IMSS | International Medical Support Services |
| IMSS | International Macrobiotic Shiatsu Society |
| IMSS | Image Management Systems and Support Corporation |
| IMSS | International Maritime Service & Survey Ltd. (various locations) |
| IMSS | Intermountain States Seminar |
| IMSS | Institut Municipal de Serveis Socials (French) |
| IMSS | Importa Madres Su Salud (México) |
| IMSS | Inter-Movement Support System |
| IMSS | Information Management and Security Staff (US Department of Justice) |
| IMSS | Integrated Mission Support System |
| IMSS | Internet Multimedia Sprachensystem (German) |
| IMSS | International Math and Science Study |
| IMSS | Integrated Management Safety Standards |
| IMSS | Improved Modular Sleeping System (US Army) |