| Acronym | Definition |
|---|
| SWSI➣Statewide Water Supply Initiative (Colorado) |
| SWSI➣Surface Water Supply Index (various locations) |
| SWSI➣Semantic Web Services Initiative (academic and industrial research colloquium) |
| SWSI➣Social Work Services Inspectorate (UK) |
| SWSI➣Single Width Single Inlet (fan) |
| SWSI➣Safe-Waste Systems, Inc. (waste management) |