| SISS | Salomon Information Security Services 
| Others |
| SISS | Satellite In Situ Salinity
| Others |
| SISS | Scientific Instrument Support Structure
| Others |
| SISS | Screen International Security Services
| Others |
| SISS | Secure Information Sharing System
| Others |
| SISS | SEI Initiative on Sustainable Sanitation
| Others |
| SISS | Senate Internal Security Subcommittee
| Others |
| SISS | Services for International Students and Scholars
| Others |
| SISS | Services for International Students Scholars
| Others |
| SISS | Sexual Interaction System Scale
| Others |
| SISS | Simple Imperfect Squared Square
| Others |
| SISS | Sistema Integral de Servicio Social
| Others |
| SISS | Smart Idling Stop System
| Others |
| SISS | Sociology and Interdisciplinary Social Sciences
| Others |
| SISS | Spatial Information Services Stack
| Others |
| SISS | Spatially Integrated Social Science
| Others |
| SISS | Specialist Inclusion Support Service
| Others |
| SISS | Species Identification and Survey Skills
| Others |
| SISS | Student Information and Support Service
| Others |
| SISS | Student Information Services and Systems
| Others |
| SISS | Student Intervention and Support Services
| Others |
| SISS | Swedish Institute Study Scholarships
| Others |