- Uhmann, Gerhard, 1928-2007
- Uhmann, Tanys V.
- Uh-Moo, Juan Carlos
- Uhrig, Howard.
- Uhrin, Marcel
- Uiblein, Franz
- Uiblen, Franz
- Uicab-Sabido, Amira
- Uichanco, Leopoldo B., 1894-1972
- Uiduldam, Guyai
- Uieda, Virginia Sanches
- Uieda, Wilson
- Uikens, Th. F.
- Uikey, D. E.
- Uildriks, Frederike van, 1854-1919
- Uimari, Anne
- Uittien, Hendrik, 1898-1944
- Uj, André
- Ujikama, Keidi
- Ujvárosi, Lujza
- Ukeles, Ravenna
- Ukers, William H. (William Harrison), 1873-1945
- Ukkola, T
- Ukosich, Luca
- Ukraine. Ekonomicheskiĭ sovet.
- Ukraine. Narodniĭ komisarii͡at zemelʹnikh sprav.
- Ukraine. Narodnyĭ komisarii͡at zemelʹnykh sprav.
- Ukraine. Selʹskokhozi︠a︡ĭstvennyĭ nauchnyĭ komitet. Sekt︠s︡ii︠a︡ gruntoznavstva.
- Ukraine. Silʹsʹko-gospodarsʹkiĭ naukoviĭ komitet.
- Ukuwela, Kanishka
- Ukuwela, Kanishka D B
- Ul Haq, Taqweem
- Ul Hassan, Ubaid
- Ulandowski, Letícia Karmann De Almeida
- Ulate, William
- Ulayar-Arroyo, Jaime
- Ulber, Lena
- Ulbrich, Eberhard
- Ulbrich, F.
- Ulbrich, Karin
- Ulbrich, O. E.
- Ulbricht, Albert, 1865-1927
- Ulbricht, Richard J
- Uldall, F. P.
- Ule, Carl Hermann
- Ule, Ernst Heinrich Georg
- Ule, Ernst, 1854-1915
- Ule, Otto Eduard Vincenz, 1820-1876
- Ulefors, Sven Olof
- Ulenberg, Sandrine
- Ulenberg, Sandrine A.
- Ulevicius, Alius
- Ulfig, K
- Ulfstrand, Staffan
- Ulfstrand, Staffan, 1933-
- Ulgezer, Volkan
- Ul-Haq, I
- Uliana, Laura R.
- Uliana, Marco
- Ulʹi︠a︡nin, Vasiliĭ Nikolaevich, 1840-1889
- Ulibarri, Emilio A.
- Uličný, Adam
- Uličný, Josef.
- Uline, Edwin Burton, 1867-1933
- Ulisses, Cláudia
- Ulitzka, Manfred R.
- Ulkan, Georg.
- Ulke, Henry
- Ulke, Titus
- Ulla, M. Shafaat
- Ullah, Md. Habib
- Ullah, Misbah
- Ullah, Tariq Saiff
- Ullah, Zahid
- Ullah, Zia
- Ullathorne Seed Co.
- Ullenbruch, Klaus
- Ullepitsch, Josef
- Uller, Tobias
- Ullholm, Jonas
- Ullman, L. (Ludwig).
- Ullmann, Albert Thomas
- Ullmann, Judith
- Ulloa Ulloa, Carmen, 1963-
- Ulloa, Andres
- Ulloa, Antonio de, 1716-1795
- Ulloa, Erica
- Ulloa, Héctor
- Ulloa, Jorge
- Ulloa, José
- Ulloa, Luis
- Ulloa, Mauricio
- Ulloa, Miguel
- Ulloa, Osvaldo
- Ulloa, Patricio
- Ulloa, Raúl
- Ulloa, Wilson
- Ulloa-Montemayor, Ximena
- Ulloa-Rubio, Karla A.
- Ullrich, Alexander
- Ullrich, Bernd
- Ullrich, Hans, 1913-2002
- Ullrich, James R.
- Ullrich, Richard D
- Ullyett, Henry.
- Ullyette Brothers.
- Ullyette, C. L.
- Ullyette, William.
- Ulman, Aylin
- Ulman, P. T.
- Ulmen, Karin
- Ulmer, Georg, 1877-1963
- Ulmer, Jonah
- Ulmer, Jonah M.
- Ulmer, Kevin M
- Ulmer, Torsten
- Ulrey, Ivon W. (Ivon William), 1908-
- Ulrich Nursery.
- Ulrich, August
- Ulrich, E. O. (Edward Oscar), 1857-1944
- Ulrich, Gary W.
- Ulrich, George H. F. (George Henry Frederick), 1830-1900
- Ulrich, Hans
- Ulrich, James R.
- Ulrich, John Linck, 1877-
- Ulrich, Maria Danuta.
- Ulrich, Rainer
- Ulrich, Sterling
- Ulrich, Wilhelm.
- Ulsted, Tor Henrik
- Ultsch, Gordon R.
- Ultsch, Gordon Richard, 1942-
- Ulu, Murat
- Uludag, Ahmet
- Ulukapı, Merve
- Ulukuş, Deniz
- Ulusoy, Fatma
- Ulusoy, M Rifat
- Ulyshen, Michael
- Ulysséa, Mônica Antunes
- Ulziimaa, Gombosuren
- Um Nyobe, Philène Corine Aude
- UMA Engineering Ltd.
- Uma, Eswaranpillai
- Umadilla Nurseries.
- Umali-Garcia, Mercedes, 1936-
- Umamaheswari, P.
- Umamaheswari, T
- Umamaheswari, U.
- Umaña Dodero, Gina
- Umaña, César Leandro Abozaglo
- Umaña, Fernando
- Umaña, Fernando Javier
- Umaña, María Natalia
- Umaña-Villalobos, Gerardo
- Umanets, Olha
- Umapathy, G.
- Umar, Aisha
- Umaran, Ángel
- UMass Extension.
- Umbach, Levi Menger, 1853-1918
- Umbrasko, Inta
- Umeda, Masaki
- Umemura, Yoshihiro
- Umenoya, Tsuruko, 1802-1864
- Umesh, Divya
- Umesh, P. K.
- Umetsu, Fabiana
- Umetsu, Ricardo Keichi
- Umminger, Bruce L
- Ummul-Nazrah, A. R.
- Umoh, U. O.
- Umphelby, Fanny, 1788-1852
- Umpleby, John H.
- Umpunjun, Puangpaka
- Umurungi, Yvette
- Una A F
- Unadilla Nurseries.
- Unadilla Nursery Company.
- Unadilla Nursery Farms,
- Unadilla Nursery Gardens.
- Unal, Mustafa
- Unal, Sevgi
- Unamuno e Irigoyen, Luis Mariano
- Unbekannt
- UNC Sea Grant College Program.
- Uncas Dahlia Farm.
- Unda-Harp, Karime
- Undaharta, Ni Kadek Erosi
- Undap, Nani
- Underbakke, Larry D.
- Underhill, Benjamin Mott.
- Underhill, Elizabeth M.
- Underhill, Frank P. (Frank Pell), 1877-1932
- Underhill, George D.
- Underhill, George F.
- Underhill, J. Edward
- Underhill, James C
- Underhill, L. C.
- Underhill, Leslie G.
- Underhill, Lora A.
- Undersea Science Symposium National Undersea Research Center) 1987-
- Underwood Farms.
- Underwood, Angus
- Underwood, Antony J
- Underwood, Antony, J
- Underwood, Avril H
- Underwood, Benjamin A
- Underwood, C F
- Underwood, Cecil F., 1867-1943
- Underwood, Cecilio F.
- Underwood, Charles J.
- Underwood, Dessie L. A.
- Underwood, Emma C
- Underwood, Garth
- Underwood, Graham J. C.
- Underwood, H. G.
- Underwood, Jay Gove, 1873-
- Underwood, Judson Kemp, 1898-1975
- Underwood, Loring, 1874-1930
- Underwood, Lucien Marcus, 1853-1907
- Underwood, Review By: L M
- Underwood, Review By: Lucien M
- Underwood, Robert
- Underwood, Robyn M.
- Underwood, Todd J.
- Underwood, Wm. Lyman, 1864-1929
- Underwood.
- Undlin, Kent.
- Undrits, G. F. (German Frantsevich), 1874
- UNEP World Conservation Monitoring Centre.
- Unesco.
- Unfer, Taís Cristina
- Ung, Visotheary
- Ungar, Irwin A.
- Ungaretti, Ieti
- Ungaro, Nicola
- Ungemach, Louis F.
- Unger Brothers (Berlin, Germany),
- Unger, F. (Franz), 1800-1870
- Unger, Frederic William, 1875-
- Unger, Jacob.
- Unger, Johann Friedrich.
- Unger, Johann Gottfried, 1706-1771
- Unger, K.
- Unger, Manuela
- Unger, Shem
- Ungerer, Emil, 1888-
- Ungerer, Natasha K.
- Ungerfeld, Rodolfo