- Leonard Howard (Firm)
- Leonard Seed Co.
- Leonard Seed Company.
- Leonard W. Barkley (Firm)
- Leonard W. Butt (Firm),
- Leonard,
- Leonard, A Byron
- Leonard, A. Byron (Arthur Byron), 1904-
- Leonard, Alexander B
- Leonard, Alice E.
- Leonard, Andrea
- Leonard, Anna B.
- Leonard, Anne
- Leonard, Arthur Glyn.
- Leonard, C N
- Leonard, C. Henri (Charles Henri), 1850-1925
- Leonard, Charles Lester
- Leonard, D R
- Leonard, D.S.
- Leonard, Davbid E
- Leonard, David E
- Leonard, David L
- Leonard, E C
- Leonard, Emery C.
- Léonard, Frédéric,
- Leonard, G S
- Leonard, I.
- Leonard, J
- Leonard, J L
- Leonard, J. L.
- Leonard, Janet L
- Léonard, Jean 1920-2013
- Leonard, John W., Jr.
- Leonard, Jonathan G
- Leonard, L. W. (Levi Washburn), 1790-1864
- Leonard, Leona (Leona M.)
- Leonard, M
- Leonard, Michelle R
- Leonard, Mortimer Demarest, 1890-
- Leonard, O. A. (Oliver A.)
- Leonard, O. A. (Oliver Andrew), 1911-1975
- Leonard, Pat
- Leonard, Patrick
- Leonard, Peter
- Leonard, R E
- Leonard, R L
- Leonard, R. E.
- Leonard, Richard D.
- Leonard, S. F.
- Leonard, Simeon F.
- Leonard, Stephen G.
- Leonard, Steve (Stephen G.)
- Leonard, Steve W
- Leonard, Steven
- Leonard, Steven W
- Leonard, Steven W.
- Leonard, Tina D.
- Leonard, Vernon Kenneth, Jr.
- Leonard, W J
- Leonard, Wendy J
- Leonard, William R
- Leonard, Yolanda L
- Leonardi, C
- Leonardi, Carlo
- Leonardi, G
- Leonardi, Giovanni
- Leonardi, Giuseppa Rosaria
- Leonardi, Giuseppe
- Leonardi, Gustavo, 1869-1918
- Leonardi, L
- Leonardi, Lorinda
- Leonardi, M. Soledad
- Leonardi, Maritza
- Leonardi, Monica
- Leonardi, Patricia
- Leonardi, Patricia I.
- Leonardo dos Santos,
- Leonardo Mioto, Camila
- Leonardo, da Vinci, 1452-1519
- Leonardo, Francisco Santos
- Leonardo-Silva, Lucas
- Leonard's Seeds.
- Leonarduzzi, Giulia
- León-Avendaño, Hugo
- León-Avila, Gloria
- León-Borges, José Antonio
- León-Cortés, Jorge
- León-Cortés, Jorge L.
- Leone Gold, Maria Eugenia.
- Leone, Aurora.
- Leone, Charles A
- Leone, Donald E
- Leone, E Austin
- Leone, IC
- Leone, Isabela Carnielli
- Leone, J
- Leone, Luciano Gerolim
- Leone, María F
- León-E, Roberto J.
- Leonel, Rosa M. V.
- León-Escamilla, José Antonio
- Leong, C Y
- Leong, Chee Chiew
- Leong, Chi-Man
- Leong, J M
- Leong, J. K.
- Leong, Joan M
- Leong, JoAnne C.
- Leong, K
- Leong, K H L
- Leong, K L H
- Leong, K M
- Leong, Kingston L H
- Leong, Paul.
- Leong, Pkk
- León-Gómez, Calixto
- León-Gómez, Calixto
- León-González, Jesús Angel de
- Leong-Škorničková, Jana, & H Đ Trần
- Leong-Škorničková, Jana, & H-J Tillich
- Leong-Škorničková, Jana, M Sabu And M G Prasanthkumar
- Leong-Škorničková, Jana,
- Leonhard, Karl Cäsar von, 1779-1862
- Leonhardi, Hermann Karl, Freiherr von, 1809-1875
- Leonhardi, Johann Gottfried, 1746-1823
- Leonhardt, Adriana
- Leonhardt, B.A.
- Leonhardt, Cristina
- Leonhardt, Franziska
- Leoni, Franco, 1864-1949
- Leoni, Lúcio
- Leoni, Lúcio Souza
- Leonian, Leon H. (Leon Hatchig), 1888-1945
- Leoniceno, Niccolò, 1428-1524
- Leonidas, J. de M.
- Léonide, Jean-Claude
- León-Lobos, Pedro
- León-López, M. Celene
- Leonor Quiroz, David
- Leonova, Tatyana
- Leon-Paniagua Livia
- León-Paniagua, Livia
- León-Paniagua, Livia
- León-Règagnon, Virginia
- León-Romero, Yatzil
- Leontiev-Orlov, O.
- Leontsinis, Solon
- Leontyev, D V
- León-Yánez, Susana.
- Leopardi Verde, Carlos Luis
- Leopardi, M
- Leopold I, Holy Roman Emperor, 1640-1705
- Léopold III, King of the Belgians, 1901-
- Léopold, père, O.C.R., 1884-1947
- Leopold, A C
- Leopold, A Starker
- Leopold, A. Carl (Aldo Carl), 1919-
- Leopold, Aldo
- Leopold, Aldo, 1886-1948
- Leopold, Bruce D
- Leopold, Donald Joseph, 1956-
- Leopold, E B
- Leopold, G. (Christian Gerhard), 1846-1911
- Leopold, Johann, active 1614?-
- Leopold, Luna B
- Leopold, Marc
- Leopold, Mardik F.
- Leopold, Nathan Freudenthal, 1904-1971
- Leopold, R A
- Leopoldi Joannis Kaliwoda.
- Leopoldinisch-Carolinische deutsche Akademie der Naturforscher. Bibliothek.
- Leopoldo, Paulo Rodolfo
- Leos-Rodríguez, Juan Antonio
- LePage, Ben A.
- Lepage, Denis
- Lepage, Denis
- Lepage, Ernest
- Lepage, H S
- Lepais, Olivier
- Lepak, Nika.
- Lepard, G F
- Lepe-Becerra, Luis Álvaro
- Lepeco, Anderson
- Lepei, Zhan
- Lepeletier de Saint Fargeau, Amédée Louis Michel, comte, 1770-1845
- Leper, Robert T
- Lepeshinskaia, O. B. (Ol'ga Borisovna) 1871-1963
- Lepesme, P
- Lepesme, Pierre
- Lepesqueur, Cintia
- Lépez, Irene
- Lepidoptera Research Foundation
- Lepidopterists' Society
- Lepidopterists' Society.
- Lepiksaar, Johannes
- Lépinay, L
- Lépine
- Lépine, G
- Lépine, M Jules
- Lépine, R. (Raphael), 1840-1919
- Lepisto, C
- Lepiten, M V
- Lepitzki, Dwayne A. W.
- Lépiz I., Rogelio.
- Lepiz-Ildefonso, Rogelio
- Lepley, Larry K.
- Lepofsky, Dana
- Lepoint, Gilles
- Lepointe, J
- Leponce, Maurice
- Lepont, Francois
- Lepore, Mauro L
- Leppan, Hubert Dudley, 1889-
- Leppanen, Christy
- Leppe, Marcelo
- Lepper, Dme
- Lepper, George Henry.
- Lepper, Merry G
- Leppig, Gordon
- Leppik, E. E., 1906-
- Leppla, N. C. (Norman Casey), 1945-
- Leppla, N. C.,
- Leps, Jan
- Lepsch-Cunha, Nadja
- Lepschi, B J
- Lepschi, Brenda
- Lepschi, Brendan
- Lepschi, Brendan Johann 1969-
- Lepsius, Richard, 1851-1915
- Lepthien, Larry W
- Le-Quesne, Carlos
- Lequien, F.,
- LeQuier, Stephanie
- Ler
- Leraut, P
- Leraut, Patrice
- Leray, Vincent
- LeRay, W. J.
- Lerch, E C
- Lerch, Michael L F
- Lerch, Robert ? Lekch??
- Lerche, Johann Jacob 1703-1780
- Lere, Mark Edmond, 1954-
- Lereboullet, A. (Auguste), 1804-1865
- Lereboullet, Pierre, 1874-
- Lerena, Maria Laura M.
- Leresche, Louis-François-Jules-Rodolphe
- Lerin, LA
- Lermanda, María Paz
- Lermen, Isabel S.