Encyclopedias, Almanacs, Transcripts, and Maps
- United Brethren in Christ
- United Church of Canada
- United Colonies of New England
- United Kingdom of Great Britain and Northern Ireland
- United Nations Atomic Energy Commission
- United Nations Children's Emergency Fund
- United Nations Commission for the Investigation of War Crimes
- United Nations Commission on Conventional Armaments
- United Nations Conference on Environment and Development
- United Nations Industrial Development Organization
- United Nations Members ( (table))
- United Nations Trusteeship Council
- United Press
- United Provinces (former state, India)
- United States Air Force Academy
- United States Government Printing Office
- United States Government Publishing Office
- United States Merchant Marine Academy
- United States National Museum
- United States National Science Foundation