| Acronym | Definition |
|---|
| ISSS➣International Student and Scholar Services |
| ISSS➣International Society for the Systems Sciences |
| ISSS➣Information Society Standardization System |
| ISSS➣Instituto Salvadoreño del Seguro Social (Salvadorean Institute of Social Security) |
| ISSS➣International Scholar and Student Services (various schools) |
| ISSS➣International Software Systems Solutions (Florida) |
| ISSS➣International Society of Soil Science |
| ISSS➣International Soil Science Society (Italy) |
| ISSS➣International Symposium on Systems Synthesis |
| ISSS➣International Society for Seed Science (Vermillion, South Dakota) |
| ISSS➣Initial Sector Suite System |
| ISSS➣International Symposium on Skill Science |
| ISSS➣Information Systems Security Standards |
| ISSS➣Installation Service Supply Support |
| ISSS➣International Services for Students & Scholars |
| ISSS➣Instituto da Solidariedade e Segurança Social (Portugal) |
| ISSS➣Inherent Secondary Shutdown System |
| ISSS➣Internet Self Service and Security (Sprint) |
| ISSS➣Interim Strategic Storage Site |
| ISSS➣Interdisciplinary Studies-Social Sciences (various schools) |
| ISSS➣IMASE Simulation and Scoring Subsystem |
| ISSS➣In Service Support System (weaponry) |