- War
- Wastewater Treatment
- Water Quality
- Water Reuse
- Water Treatment
- Waterborne Diseases
- Well-Baby Clinics
- Wellness Behavior
- Widowhood
- Winslow, Charles-Edward Amory
- Women, Infants, and Children Program (WIC)
- Women's Health
- Workplace Smoking Policies and Programs
- Worksite Drug Testing
- World Bank
- World Health Organization
