| wAMD | wet AMD |
| WAN | Wide Area Networks |
| WARF | Wisconsin Alumni Research Foundation |
| WAT | Wax Appearance Temperature |
| WBC | White Blood Cell |
| WBCSD | World Business Council for Sustainable Development |
| WCM | Web Content Management |
| WEHI | Walter & Eliza Hall Institute (Australia) |
| WFE | Wiped Film Evaporation |
| WGS | Water Gas Shift |
| WH Women | Womens Health |
| WHC | Water Holding Capacity |
| WHO | World Health Organization |
| WII | W Innovation Index |
| WIPO | World IP Organization |
| WM | Waldenströms Macroglobulinemia |
| WMD | Weapons of Mass Destruction |
| WMV | Watermelon Mosaic Virus |
| WO | World Organization (See PCT) |
| WSO | Water Soluble Organics |
| WTO | World Trade Organization |
| WWTP | Waste Water Treatment Plant |
| WWW | World Wide Web (internet) |