| whse | warehouse |
| washout (noun), wash out (verb) |
| WHAT | wastewater holding and treatment |
| water-cooled |
| W | watt |
| Wh | watt-hour |
| Wb | weber |
| wt | weight |
| wt % or w/o | weight percent |
| W/V | weight-to-volume ratio |
| W/W | weight-to-weight ratio |
| WPS | welding procedure specification |
| W | Westinghouse |
| WEXTEX | Westinghouse Explosive Tube Expansion |
| WOG | Westinghouse Owners Group |
| WL | wind load |
| wo | work order |
| workload |
| WANO | World Association of Nuclear Operators |
| worst-case (adj), worst case (noun) |
| yd | yard(s) |
| ZPA | zero period acceleration (ground acceleration) |
| ZOI | zone of influence |