- Troschel, Peter, approximately 1620-approximately 1667
- Troshkina, Victoria
- Trost, Alma Edmundovna.
- Trost, Charles H. (Charles Henry), 1934-
- Trost, John Francis, 1897-1972
- Trost, Martin
- Trost, Robert E.
- Tröster, G
- Troth, Henry.
- Troth, R. G.
- Trott, A. C.
- Trott, Alexis
- Trotta, Marcelo N. F.
- Trotta-Moreu, Nuria
- Trotter, A. (Alessandro), 1874-1967
- Trotter, Elizabeth S
- Trotter, George Baird, 1948-
- Trotter, Lionel James.
- Trotter, Robert
- Trotter, Robin
- Trotter, Spencer
- Trotter, Warren K. (Warren Kingsbury), 1922-2002
- Trottet, M
- Trotti, Paolo
- Trottier, Garry C. 1946-
- Trottier.
- Troubridge, Jim
- Trouessart
- Trouessart, E.-L. (Edouard-Louis), 1842-1927
- Troughton, Ellis (Ellis LeGeyt) 1893-1974
- Troughton, S C
- Trouin, Michèle
- Troukens, Willy
- Troup Nursery Company.
- Troup, Robert Scott, 1874-1939
- Troupin, Georges
- Trouse, Albert C.
- Trout Unlimited Canada.
- Trout Unlimited. Big Blackfoot Chapter.
- Trout, Keeper
- Trout, Richard
- Trout, Robert, 1952-
- Troutbeck Nursery.
- Trouvelot, A
- Trouvelot, L.,
- Trouwborst, Arie
- Trovant, Berenice
- Trovão, Dilma Maria de Brito Melo
- Trovao, Joao
- Trovati, Roberto Guilherme
- Trovó, Marcelo
- Trovo, Paola Viviana
- Trow & Smith,
- Trow Press.
- Trow, Albert Howard, 1863-1939
- Trowbridge, Albert H
- Trowbridge, Augustus
- Trowbridge, C. C.
- Trowbridge, Carolyn
- Trowbridge, Cynthia D.
- Trowbridge, David
- Trowbridge, Elinore B.
- Trowbridge, Harry M
- Trowbridge, John
- Trowbridge, Mary L.
- Trowbridge, Nan
- Trower, Julie
- Trowitzsch & Son (Berlin, Germany),
- Trow's Printing and Bookbinding Company
- Troy Chemical Co.
- Troy Nurseries.
- Troy Seed House.
- Troy, Edward P E
- Troy, Hugh Charles, 1867-
- Troy, J. H.
- Troy, Sally
- Troy, Waldo
- Troyanskaya, Olga
- Troya-Rodríguez, Diana
- Troyer, Byron L.,
- Troyer, Cynthia Lee Ann
- Troyer, Willard A.
- Troyo-Diéguez, Enrique
- Troy's Garden Nurseries.
- Troy's Nurseries, Inc.
- Truax, firm, manuf.
- Truax, Margaret Ward.
- Truax, T. R. (Thomas Roy), 1886-
- Trübner & Co.
- Trübner, Nicolas
- Truby, Albert E. (Albert Ernest), 1871-1954
- Trucco Alemán, Carlos Eduardo
- Trucco, María Inés
- Truche
- Truchot, Jean-Paul
- Truckenbrod, Allison.
- Trudell, Yves.
- Trudgen, M
- Trudgen, M. E.
- Trudgen, Malcolm
- True, Alfred Charles, 1853-1929
- True, Daniel G.
- True, Frederick W. (Frederick William), 1858-1914
- True, Gordon H
- True, Katherine
- True, Katherine M.
- True, Rodney H. (Rodney Howard), 1866-1940
- True, T. J.
- True, Webster Prentiss, 1892-
- Trueb, Linda.
- Truelove, Ann
- Trueman, E. R. (Edwin Royden), 1922-
- Trueman, John W. H.
- Trueman, Stephen
- Trueman, Trevor
- Truesdale, G. A.
- Truesdale, Harold D
- True-To-Name Nursery.
- Truex, Richard L.
- Trufem, Sandra Farto Botelho
- Truffelli, G. Thomas
- Trugilho, Paulo Fernando
- Truhelka, Ćiro, 1865-1942
- Trujano Ortega, Marysol
- Trujillo Vera, Carlos
- Trujillo, Angie Carolina
- Trujillo, Cristina
- Trujillo, David P.
- Trujillo, Domingo
- Trujillo, Edwin
- Trujillo, Ernesto
- Trujillo, Héctor
- Trujillo, Larry
- Trujillo, Lilian E.
- Trujillo, Lucerina
- Trujillo, Mateo.
- Trujillo, Pedro Gili
- Trujillo, Verónica Liza
- Trujillo, William
- Trujillo-Arcila, Carlos
- Trujillo-Arias, Natalia
- Trujillo-Bolio, Ivan
- Trujillo-Gonzalez, Alejandro
- Trujillo-Narcía, Antonio
- Trujillo-Pérez, Bertín
- Trullinger, F. L.
- Trullinger, Robert William, 1889-
- Truman, Harry V
- Truman, James W
- Truman, Matthew
- Truman's Pioneer Stud Farm.
- Trumbauer, David Sidney.
- Trumble, John T.
- Trumbo, Michael
- Trumbo, Stephen T.
- Trumbore, Susan Elizabeth
- Trumbower, M. R. (Milton R.)
- Trumbule, R. B.
- Trumbull & Beebe.
- Trumbull & Co.
- Trumbull Seed Co.
- Trumbull, Gurdon, 1841-1903
- Trumbull, H. L. (Harlan Leo), 1886-1981
- Trumbull, J. Hammond (James Hammond), 1821-1897
- Trumbull, Strean & Allen Seed Co.
- Trumbull, William
- Trummer, Lori.
- Trump, Gary
- Trumper, Eduardo V.
- Trumpler, Robert
- Trung Thanh, Nguyen
- Trung, Cao Tien
- Trunk, Charles.
- Trunz, Vincent.
- Truog, Emil, 1884-
- Truong, Ba Vuong
- Truong, Do Van, 1984-
- Truong, Doan Nhat
- Truong, Hang Thi Thu
- Truong, Quang Nguyen
- Truong, Quang Tam.
- Truong, Quynh A.
- Truong, Simone Thi-Hue
- Truong, Tuan
- Trương, Xuân Lam
- Truqui, Eugenio, 1860
- Trusch, Robert
- Trusler, John, 1735-1820
- Trusler, Peter
- Trussell, D. F.
- Trussell, R. William
- Trusso, Nina
- Trust for Oriental Ornithology
- Trust for Public Land (U.S.)
- Trustees of Public Reservations (Mass.)
- Trusty, Jennifer L
- Truxal, Fred S.
- Truxillo, Pedro, active 1813-
- Truylio, Betânia
- Truzzi, B. S.
- Trybom, Filip
- Tryer, M A
- Tryjanowski, Piotr
- Tryon, Alice F.
- Tryon, Clarence Archer, 1911-
- Tryon, Earl Haven, 1946-
- Tryon, George W., (George Washington), 1838-1888
- Tryon, Henry
- Tryon, Henry, 1856-1943
- Tryon, Rolla M. (Rolla Milton), 1916-2001
- Tryons Dahlia Garden.
- Tryons Dahlia Gardens.
- Tryphiodorus
- Tryrom, Filip
- Trytsman, Marike
- Trýzna, Miloš
- Trzciński, Paweł
- Trzeciak-Limeira, Flavia
- Tsacas, Leonidas
- Tsafack, Noelline
- Tsai, Cheng-Lung
- Tsai, Chi-Li
- Tsai, Chun-Yang
- Tsai, Ichen
- Tsai, James H.
- Tsai, Jing-Fu
- Tsai, Ming-Yu
- Tsai, Peter I.
- Tsai, Siu Mui
- Tsai, Sophia H
- Tsai, Wan-Hsin
- Tsai, Whitney L E
- Tsampazis, Triantafyllos
- Tsang, L.
- Tsang, Peter
- Tsang, Susan M.
- Tsangaras, Kyriakos
- Tsao, Yao Fong
- Tsarskitie prirodonauchni instituti (Sofiia, Bulgaria)
- Tsatsia, Francis
- Tsaur, Shun-Chern
- Tschanz, Beat
- Tschanz, Karl
- Tschapeck, Hippolyt
- Tschapka, Marco, 1965-
- Tscharntke, Teja
- Tscherbakoff, S. G.
- Tschermak, Erich, 1871-
- Tschermak, Gustav, 1836-1927
- Tscherter, Ursula