- Tetsana, Naiyana
- Tetsuo, Harada
- Tettamanti, Germán
- Tettelbach, Stephen T.
- Têtu, Horace, 1842-1915
- Tetu, Sasha G
- Tetzner, Robert Hermann
- Tetzner, Wilhelm.
- Teuber, Nolberto
- Teubner, B. G. (Benediktus Gotthelf), 1784-1856
- Teuchert, R. W.
- Teufel, Conrad, III
- Teufl, Pia
- Teugels, Guy G.
- Teulon, David
- Teunissen, Herman, 1914-1992
- Teuscher, David.
- Teuscher, Henry 1891-1984
- Teuscher, Miriam
- Teutli León, María M.
- Teutli-Hernández, Claudia
- Teutsch-Felber, Dorothea
- Tevesz, Michael J. S.
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- Tevis, William S., jr.
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- Tews, Jörg
- Tews, L L
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- Texeira, Álvaro A.C.
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- Texeira, R. H. F.
- Texeira, Valeria W.
- Texidor y Cos, Juan
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- Teysmann, Johannes Elias, 1808-1882
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- Th. F. Van der Meulen (Firm)
- Th., F
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- Thacer, Helena Duryea
- Thach, Nguyen
- Thach, Nguyen Ngoc
- Thach, Phanara
- Thacher, James, 1754-1844
- Thacher, Jeanie I. W.
- Thacher, Mrs. Alfred B.
- Thacher, Thomas Anthony, 1815-1886
- Thacker Gardens.
- Thacker, Alan.
- Thacker, Christine E.
- Thacker, G. W.
- Thacker, Gale W.
- Thacker, T. L.
- Thackeray, Tejas
- Thackray, John C. (John Christopher), 1948-1999
- Thadathil, Pankajakshan
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- Thadeo, Marcela
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- Thammachoti, Panupong
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- Thanh Dong, Hai
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- Thapa, Tej Bahadur
- Thapa, Til Kumari
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- Thapar, Gobind Singh
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- Thaung, Maung Mya
- Thaung, Ret
- Thauvette, Darcie
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- Thawatchai, Santisuk
- Thaweesakdi Boonkerd.
- Thawthong, Anan
- Thaxter, Celia, 1835-1894
- Thaxter, Mabel
- Thaxter, Roland, 1858-1932
- Thayer Fruit Farms.
- Thayer, Abbott Handerson, 1849-1921
- Thayer, C. C.
- Thayer, D. W.
- Thayer, E. F.
- Thayer, Emma Homan, 1842-1908
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- Thayer, John Eliot, 1862-1933
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- Thayer, John W.
- Thayer, Joseph Henry, 1828-1901
- Thayer, Margaret K.
- Thayer, Mary V.,
- Thayer, Nathaniel,
- Thayer, Nora
- Thayer, Rachel
- Thayer, Russell
- Thayer, Ruth
- Thayer's Gardens.
- Thayn, G. F.
- Thays, Carlos, 1849-1934
- The Bioschemas Community
- The Bishop of Tasmania
- The Editor
- The Editor
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- The Republican
- The Roberts Rose Company
- The South African Seed Co.,
- Theaker, T L
- Theakston, Michael.
- Theakston, R. David G.
- Theau, Jerome
- Thébaud, Augustus J., 1807-1885
- Thébault, V