- U ... U.S.A.
- U.S.A. ... Ubu roi
- UBV system ... ʿUdhrī
- UDI ... Uganda, Bank of
- Uganda, flag of ... ujigami
- Ujiji ... Ulanova, Galina Sergeyevna
- Ulanqab ... Ulrich, Saint
- Ulrika Eleonora ... ultrasound
- ultrasound ... umbel
- Umbellales ... UMPA
- umpire ... uncia
- uncia ... Under the Skin of the Statue of Liberty
- Under the Tree ... Underwater!
- underway bottom sampler ... Ung må verden ennu være
- Ungar, Stu ... Uniform Determination of Death Act
- uniform distribution ... Union Internationale de Pentathlon Moderne et Biathlon
- Union Internationale de Radiophonie ... Unison
- UNISON ... United Democratic Movement
- United Democratic Party ... United Nations Mission to the Central African Republic
- United Nations Monetary and Financial Conference ... United States Border Patrol
- United States Bullion Depository ... United States presidential election of 1864
- United States presidential election of 1868 ... United States Women’s Amateur Championship
- United States Women’s Bureau ... universal life insurance
- Universal life insurance combines coverage with savings—but not without trade-offs ... University of Texas clock tower shooting
- university press ... Uns et les autres, Les
- Unsafe at Any Speed ... ununpentium
- ununquadium ... Upington
- Upjohn’s Rural Architecture ... Uppsala
- Uppsala Academy of Science ... Uralskie Gory
- Uralskie Mountains ... Urban, Keith
- Urban, Keith Lionel ... Uriel
- Uriel Acosta ... ʿurs
- Ursa Major ... USA
- Usa ... Using the 50-30-20 rule to power your household budget
- Using the stochastic oscillator to anticipate market turning points ... Usumacinta River
- Usuman dan Fodio ... Utilitarianism
- utilitas ... Uus
- Uusikaupunki, Treaty of ... Uzziah