In bold, the official abbreviations
- Ubick, D Darrell Ubick
- Uchida, T Tohru Uchida (1897–1981)
- Ucria, B (Ucria) Bernardino da Ucria (1739–1796)
- Uddin, S Shuja Uddin
- Uechi, N (Uechi) Nami Uechi
- Uechtritz, MFS (Uechtr.) Maximilian Friedrich Sigismund von Uechtritz (1785–1851)
- Uechtritz, RKF (R.Uechtr.) Rudolf Karl Friedrich von Uechtritz (1838–1886)
- Ueckermann, EA Edward A. Ueckermann
- Ueda, K (Ueda) Kyoichiro Ueda
- Ueda, T (T. Ueda) Tatsuya Ueda
- Uehara, J (Uehara) Jiro Uehara
- Uémura, Y (Uémura) Yoshinobu Uémura
- Ueno, SI Shun-Ichi Uéno
- Ueshima, N Norihiro Ueshima
- Uetanabaro, APT Ana Paula Trovatti Uetanabaro
- Uffenorde, H Henning Uffenorde
- Uglitzkich, AN (Uglitzk.) Alexander Nikolaevich Uglitzkich (1876–?)
- Ugueto, CE Carmen Escalante de Ugueto
- Uğurlu, Z (Uğurlu) Zübeyde Uğurlu (fl. 2015)
- Uhl, NW (N.W.Uhl) Natalie Whitford Uhl (1919– )
- Uhler, PR Philip Reese Uhler (1835–1913)
- Uhlig, V Viktor Uhlig (1857–1911)
- Uhmann, E Erich Uhmann (1881–1968)
- Uhmann, G Gerhard Uhmann (1928–2007)
- Uiblein, F (Uiblein) Franz Uiblein
- Uijs, R. (Uijs) Ronald Uijs (fl. 1994)
- Ujhelyi, J (Ujhelyi) József Ujhelyi (1910–1979)
- Uklonskaja, MI (Uklonsk.) Maria Ivanovna Uklonskaja (1888–19??)
- Ukrainsky, AS A.S. Ukrainsky
- Üksip, AA (Üksip) Albert Aleksander Üksip (1886–1966)
- Ulber, TM Thomas M. Ulber
- Ulbrich, OE (Ulbr.) Oskar Eberhard Ulbrich (1879–1952)
- Ule, EHG (Ule) Ernst Heinrich Georg Ule (1854–1915)
- Uliczny, F Frank Uliczny
- Uline, EB (Uline) Edwin Burton Uline (1867–1933)
- Ulke, H Henry Ulke (1821–1910)
- Ulmer, G Georg Ulmer (1877–1963)
- Ulmer, T (Ulmer) Torsten Ulmer (1970– )
- Uloth, W(LH) (Uloth) W.(L.H.) Uloth (1833–1895)
- Ulrich, A Andreas Ulrich
- Ulrich, CJ Carl Jost Ulrich
- Ulrich, EA Edward Oscar Ulrich (1857–1944)
- Ulrich, H (Hans Ulrich) Hans Ulrich
- Ulvinen, T (T.Ulvinen) Tauno Ulvinen (1930– )
- Umaña, L (L.Umaña) Loengrin Alfonso Umaña-Tenorio
- Umber, RE Ray E. Umber
- Underwood, CF Cecil Frank Underwood (1867–1943)
- Underwood, LM (Underw.) Lucien Marcus Underwood (1853–1907)
- Unger, F (Unger) Franz Unger (1800–1870)
- Ungerer, MC Mark C. Ungerer (fl. 1997)
- Ungern-Sternberg, F (Ung.-Sternb.) Franz Ungern-Sternberg (1808–1885)
- Unni, KS (Unni) K. Sankaran Unni (fl. 2011)
- Unruh, CM (Unruh) Corinne M. Unruh
- Unterstein, W Walter Unterstein
- Unverricht, C (Unverr.) Carl Unverricht (1809–1883)
- Unwin, DM David M. Unwin
- Uotila, PJ (Uotila) Pertti Johannes Uotila (1944– )
- Upadhyay, HBP (H.B.P. Upadhyay) H.B.P. Upadhyay
- Upchurch, GR Garland R. Upchurch, Jr. (1952– )
- Upchurch, P Paul Upchurch (1965– )
- Uphof, JCT (Uphof) Johannes Cornelius Theodorus Uphof (1886– )
- Upreti, DK (Upreti) Dalip Kumar Upreti
- Upson, ME Merlin Edward Upson
- Upson, TM (Upson) Tim M. Upson (fl. 1996)
- Uramoto, M Masakazu Uramoto
- Urbain, A Achille Urbain (1884–1957)
- Urban, A (A.Urb.) Alexander Urban
- Urban, D Danúncia Urban
- Urban, H Hermann Urban
- Urban, I (Urb.) Ignatz Urban (1848–1931)
- Urbanavichus, GP (Urbanav.) Gennadii Pranasovich Urbanavichus
- Urbatsch, LE (Urbatsch) Lowell Edward Urbatsch (1942– )
- Urbina y Altamirano, M (Urbina) Manuel Urbina y Altamirano (1843–1906)
- Ureta, E Emilio Ureta (1907–1959)
- Urgorri, V Victoriano Urgorri
- Uribe, AL Uribe (L.Uribe) Antonio Lorenzo Uribe Uribe (1900–1980)
- Urlichs, M Max Urlichs
- Urquhart, A Arthur Urquhart
- Urriza, R Rolly Urriza
- Ursch, E (Ursch) Eugène Ursch (1882–1962)
- Urtubey, E (Urtubey) Estrella Urtubey (fl. 1999)
- Urumoff, IK (Urum.) Ivan Kiroff Urumoff (1857–1937)
- Usinger, RL Robert L. Usinger
- Usmonov, M (Usmonov) Mansur X. Usmonov
- Ussachov, DA Dmitriy Anatolievich Ussachov (1944–)
- Ussher, HT Herbert Taylor Ussher (1836–1880)
- Usteri, P (Usteri) Paul Usteri (1768–1831)
- Ustjuzhanin, PY (Ustjuzhanin) Petr Ya. Ustjuzhanin
- Uthmöller, W Wolfgang Uthmöller
- Utiger, U Urs Utiger
- Utinomi, H Huzio Utinomi (1910–1979)
- Utley, JF (Utley) John F. Utley (1944– )
- Utochkin, AS Aleksander Stepanovich Utochkin
- Utsunomiya, T Taeko Utsunomiya
- Uvarov, BP Boris Petrovich Uvarov (1888–1970)
- Uyeki, H (Uyeki) Homiki Uyeki (1882– )
- Uyemura, T Toshio Uyemura (1909–1988)
- Uysal, T. (Uysal) Tuna Uysal (fl. 2005)
- Uzel, J Jindřich Uzel (1868–1946)
- Uzunhisarcıklı, ME (Uzunh.) Mehmet Erkan Uzunhisarcıklı (fl. 2005)
- Uzunov, D (Uzunov) Dimitar Uzunov (fl. 2002)
- Uzzell, TM Thomas Marshall Uzzell, Jr. (1932– )