| Abbreviation | Definition |
|---|---|
| WNRO | Week Number Roll Over |
| WNTD | World No Tobacco Day |
| WOCY | Week Of the Child and Youth |
| WOWP | Week Of the Working Parent |
| WOYC | Week Of the Young Child |
| WPAW | World Population Awareness Week |
| WPFD | World Press Freedom Day |
| WPN | World Percussion Night |
| WPPD | World Peace and Prayer Day |
| WPPD | Worldwide Pinhole Photography Day |
| WPUD | World Peace and Understanding Day |
| WRD | Windows Refund Day |
| WRW | Waste Reduction Week |
| WRWD | World Rural Women's Day |
| WSD | World Subjectrights Day |
| WSD | World Surveillance Day |
| WSLD | Western Service Learning Days |
| WTBD | World Tuberculosis Day |
| WTCD | World T'ai Chi & QiGong Day |
| WTCD | World Tai Chi Day |