- UC Hastings
- UCare
- UCLA
- UCR
- Ultra Care Management LLC
- UMass Boston
- UMass Chan Medical School
- UMass Memorial Medical Center
- Union Life Insurance Co.
- United Church Homes
- United Church Homes and Services
- United Hebrew Geriatric Center
- United Hospital Fund
- United Medical Supply
- United Methodist Homes
- United Methodist Retirement Communities
- UnitedHealth
- UnitedHealth Group
- UnitedHealthcare
- UnityPoint Health