NWIS
| Acronym | Definition |
|---|---|
| NWIS | National Water Information System |
| NWIS | North West Interconnected System (Australia) |
| NWIS | National Water Inventory System (USGS) |
| NWIS | Nick White Instrumentation Services (est. 2004; Australia) |
| NWIS | New World International School (Tokyo, Japan) |
| NWIS | Navy WWMCC Information System |
| NWIS | Non-Wastewater Irrigated Soils (soil science) |