SWSI
| 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) |