| Abbreviation | Definition |
|---|---|
| WGSD | Working Group on Space Debris |
| WGSS | Working Group on Sky Surveys |
| WGSU | Water Glycol Service Unit |
| WHISPER | Waves of HIgh frequency and Sounder for Probing of Electron density by Relaxation (Cluster experiment) |
| WHP | With High Probability |
| WHR | Watt-HouR |
| WHRU | Waste Heat Recovery Unit |
| WIB | When Interrupt Block |
| WIF | Water Immersion Facility |
| WIFS | Wide Field Sensor |
| WIN | Irwin, Australia, Deep Space Network station |
| WIND | Interplanetary Physics Laboratory |
| WINDS | Weather Information Network Display System |
| WIRC | Wide-field Infra- Red Camera |
| WIRO | Wyoming InfraRed Observatory |
| WISP | Waves In Space Plasma |
| WIX | Wait for IndeX |
| WL | WaveLength |
| WL | WerkstoffLabor (Spacelab D-1 Experiment) |
| WLE | Wing Leading Edge |