| ISS(S) | Injury Severity Score(S) 
| Others |
| ISSS | Index of Sociometric Status Scores
| Others |
| ISSS | Information Society Standardi Sation
| Others |
| ISSS | Information Society Standardisation Systems
| Others |
| ISSS | Information Society Standardization System
| Others |
| ISSS | Information-Seeking Support System
| Others |
| ISSS | Integrated Software Service Station
| Others |
| ISSS | International Services for Students and Scholars
| Others |
| ISSS | International Services for Students Scholars
| Others |
| ISSS | International Society for Seed Science
| Others |
| ISSS | International Society for the Social Studies
| Others |
| ISSS | International Society for the Study of Surrealism
| Others |
| ISSS | International Society for the System Sciences
| Others |
| ISSS | International Society for the Systems Sciences
| Others |
| ISSS | International Society of Soil Science
| Others |
| ISSS | International Student and Scholar Services
| Others |
| ISSS | International Student Scholar Services
| Others |
| ISSS | International Student Support Service
| Others |
| ISSS | International Students and Scholar Services
| Others |
| ISSS | International Surgical Sleep Society
| Others |
| ISSS | International Symposium on Systems Synthesis
| Others |
| ISSS | Internet Service Support System
| Others |