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Uda
- Udayana (India, ?–?)
- Ueno, Kenji (Japan, born 1945)
- Ufimtsev, Petr (Soviet Union, born 1931)
- Ugail, Hassan (Maldives, born 1970)
- Ugbebor, Olabisi (Nigeria, born 1951)
- Uhlenbeck, George (?, 1900–1988)
- Uhlenbeck, Karen (USA, born 1942)
- Uhlmann, Gunther (Chile, born 1952)
- Ulacq, Adrien (Netherlands, ?–?)
- Ulam, Stanislaw (?, 1909–1984)
- Ulcigrai, Corinna (Italy, born 1980)
- Ülger, Ali (Turkey, ?–?)
- Ullman, Joseph L. (USA, 1923–1995)
- Ullmo, Emmanuel (France, born 1965)
- Ulloa, Ramón María Aller (Spain, 1878–1966)
- Ulm, Helmut (Germany, 1908–1975)
- Ulmer, Douglas (USA, born 1960)
- Ulyanov, Pyotr Lavrentyevich (Russia, 1928–2006)
- Umaswati (Ancient India, ?–?)
- Umov, Nikolay (Russia, 1846–1915)
- Unguru, Sabetai (?, born 1931)
- Upadhyaya, Gangesha (India, born 13th century)
- Upton, Francis Robbins (USA, 1852–1921)
- al-Uqlidisi, Abu'l-Hasan (Medieval Arabia/Medieval Syria/Medieval Iraq, 920–990)
- Uraltseva, Nina (Russia, born 1935)
- Urban, Eric (?, ?–?)
- Urbanik, Kazimierz (Poland, 1930–2005)
- Uribe, Bernardo (Colombia, born 1975)
- Urquhart, Alasdair (Scotland, born 1945)
- Urquhart, Thomas (Scotland, 1611–1660s)
Urs
- Ursell, Fritz (Britain, 1923–2012)
- Ursell, Harold Douglas (England, 1907–1969)
- Ursin, Georg Frederik (Denmark, 1797–1849)
- Urysohn, Pavel (Russia, 1898–1924)
- Usiskin, Zalman (USA, ?–?)
- Uspensky, J. V. (Russia/Soviet Union, 1883–1947)
- Uspensky, Vladimir Andreyevich (Russia/Soviet Union, 1930–2018)
- Utreras, Florencio (Chile, born 1951)
- Utts, Jessica (USA, ?–?)
- Uzer, Turgay (Turkey, ?–?)