| Acronym | Meaning |
| WIN | Wwmccs Intercomputer Network |
| WIP | Weight Improvement Program |
| WIP | Work In Progress (process) |
| WIU | Wing Interface Unit |
| WL | Water Line |
| WMED | Medium Endurance Cutter (uscg 270) |
| WORD | 2 Bytes (16 Bits) Of Digital Computer Storage |
| WORM | Write Once Read Many |
| WOW | Weight On Wheels Switch |
| WPAFB | Wright Patterson Ait Force Base |
| WPC | Work Package Concept |
| WPE | Word Processing Equipment |
| WPN | Weapons Procurement Navy |
| WRA | Weapons Replaceable Assembly |
| WRU | Weapons Replaceable Unit |
| WS | Weapon System |
| WS | Wing Station |
| WS | Wing Stow |
| WSAP | Weapon System Acquisition Process |
| WSECP | Weapon System Engineering Change Proposal |
| WSF | Weapon System File |
| WSHLD | Windshield |
| WSIP | Seapon System Improvement Program (s-3) |
| WSPD | Weapon System Planning Data |
| WSPD | Weapon System Planning Document |
| WST | Weapon System Trainer |
| WT | Weight |
| WTHR | Weather |
| WTT | Watch Team Trainer |
| WTT | Weapons Tactics Trainer |
| WUC | Work Unit Code |
| WUF | Work Utilization Form |
| WWMCCS | Worldwide Military Command And Control System |
| WX | Weather |
| WYPT | Waypoint |
| X | X Window System |
| X3H4 | Framework Convergence Working Group |
| X3H6 | Irds Working Group |
| XADR | Transmit Address |
| XCHANGR | Exchanger |
| XDCR | Transducer |
| XFMR | Transformer |
| XFREQ | Transmit Frequency |
| XMIT | Transmit |
| XMT | Transmit |
| XMTR | Transmitter |
| XTI | X/open Transport Interface |
| XTRAN | Cross Transfer |
| XVT | X Virtual Terminal |
| YAG | Miscellaneous Auxiliary (self-propelled)(misc) |