- UAP
- Unique Acceptance Procedure
- UIC
- International Union of Railways
- UN/ECE
- United Nations - Economic and Social Council
- UNI
- Ente Nazionale Italiano di Unificazione (National Member for Italy)
- UNICE
- Union of Industrial and Employers’ Confederations of Europe
- UNIFE
- The European Railway Industry
- UNMZ
- Czech Office for Standards, Metrology and Testing (National Member for the Czech Republic)
- UQ
- Updating Questionnaire
- UTE
- Union Technique de l'Electricité et de la Communication
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