- Ultraviolet Radiation
- Uncertainty Analysis
- Unemployment and Health
- UNICEF
- Uninsurance
- United Nations High Commissioner for Refugees
- United States Agency for International Development (USAID)
- United States Consumer Product Safety Commission
- United States Department of Agriculture (USDA)
- United States Department of Energy (USDOE)
- United States Department of Health and Human Services (USDHHS)
- United States Preventive Services Task Force (USPSTF)
- United States Public Health Service (USPHS)
- Universal Precautions
- Urban Health
- Urban Social Disparities
- Urban Sprawl
- Urban Transport
- Urinalysis
- Urine Cytology
- Urine Dipstick
- Uterine Cancer
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