- WWTC (World Wide Talent Contest)
- WWTDP (Wyoming Western Trails Digitization Project)
- WWTG (What Was That Game?)
- WWTL (Worcestershire Workout Training & Leisure)
- WWTP (WasteWater Treatment Plant)
- WWTS (Waste Water Treatment Solution)
- WWTU (Wastewater Treatment Unit)
- WWTW (Waste Water Treatment Works)
- WWTZ (Western Wisconsin Technology Zone)
- WWU (WasteWater Utility)
- WWUA (Western Washington Umpires Association)
- WWUB (Walla Walla Union- Bulletin)
- WWUC (Washington Water Utility Council)
- WWU-E (Western Washington University - Everett)
- WWUG (WorldWide Users Group)
- WWUI (Western Wildland Urban Interface)
- WWUK (Water Works United Kingdom)
- WWUM (Westfälische Wilhelms- Universität Münster)
- WWUN (WorldWide Universities Network)
- WWUP (Working With the Underserved Preceptorship)
- WWUU (World Wide Used Utility)
- WWV (Wagner-Werk-Verzeichnis (catalog of the works of Richard Wagner, and callsign of NIST's shortwave radio station in Fort Collins, Colorado))
- WWVA (Walla Walla Valley Academy)
- WWVB (Standard Time And Frequency Station, 60KHz, Fort Collins, Colorado)
- WWVC (Worldwide Vacation Club)
- WWVF (World Wide Video Festival)
- WWVH (Standard Time And Frequency Station, 2.5 Mhz, 5 Mhz, 10 Mhz, 15 Mhz, Kekaha, Kauai, Hawaii)
- WWVR (World Wide Veterans Radio)
