| Ukraine : @ |
| UNESCO : @ |
| Union de l'Europe occidentale (UEO) : @ @ @ |
| Union européenne : @ (75 à 150) @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ |
| Union pour la démocratie française (UDF) : @ |
| Universités. France : @ @ |
| Urba, Affaire : @ |
| Urbanisme. Allemagne : @ @ ; Etats-Unis : @ ; France : @ @ @ @ @ @ @ @ @ @ @ ; Pologne : @ |
| Uruguay : @ |
| Usagers. France : @ |