Unit - VFW
- unit
- unit rule
- Unitarian Universalist Association
- Unitarians
- Unitas, John Constantine (Johnny)
- UNITE
- United Airlines
- United Artists
- United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada
- United Auto Workers
- United Automobile Workers
- United Automobile, Aerospace and Agricultural Implement Workers of America
- United Brands Co.
- United Brotherhood of Carpenters and Joiners of America
- United Cerebral Palsy
- United Church of Christ
- United Colonies of New England
- united court system
- United Daughters of the Confederacy
- United Empire Loyalists
- United Farm Workers of America
- United Farm Workers Organizing Committee
- United Farmers' League
- United Food and Commercial Workers International Union
- United Fruit Company
- United Garment Workers of America
- United Indians of All Tribes Foundation
- United Keetoowah Band of Cherokee
- United Methodist Church
- United Mine Workers of America
- United Nations Association of the U.S.A.
- United Nations Headquarters
- United Nations Service Medal
- United Negro College Fund
- United Paperworkers International Union
- United Parcel Service
- United Presbyterian Church in the USA
- United Press International
- United Rubber, Cork, Linoleum and Plastic Workers of America
- United Service Organizations
