U
- U of Toronto Press
- U of Wales P
- U P Publications Ltd
- U. K. Islamic Mission
- U. Lleida
- U. Smith
- U.N.E.P.
- U.S Department of Heath, Education and Welfare
- U.S. Department of Education
- U.S. Government Printing Office
- U.S.A.: Ottenheimer, 1980
- UAB Dargenis
- UAC
- UAHC Press
- UBC Press
- UBD Gregory's
- Ubh Pubns
- Ubi Soft
- Ubiquity Press
- Ubiworkshop
- UBS Publishers Distributors
- UBS Publishers' Distributors Ltd
- Ubsaliensis S. Academiae
- Uca
- UCB
- UCB Pharma
- UCB: United Christian Broadcasters
- UCCF
- UCCF: The Christian Unions
- UCD Architecture, University College Dublin