- Thoeny, William T.
- Thoerle, Lisa.
- Thogmartin, Wayne E.
- Thoiba, K.
- Thol, Pieter van, 1736
- Thol, S. Hul
- Thole, F. A.
- Tholemeier, Tim C.
- Thole's Gardens.
- Tholey, Charles P., 1898
- Thollesson, Mikael
- Thom, B. G. (Bruce G.)
- Thom, Charles, 1872-1956
- Thom, Dominik
- Thom, George.
- Thom, Philip A
- Thom, W. S.
- Thoma, Brent
- Thoma, Marco
- Thoma, R. F.
- Thoma, S.
- Thomaes, Arno
- Thomaides, Christos
- Thomann, Thierry
- Thomas & Sons (London, England)
- Thomas A, Munroe
- Thomas A. Garey (Firm)
- Thomas A. Lacey (Firm)
- Thomas A. Lacey (Firm),
- Thomas B. Meehan & Co.
- Thomas B. Meehan Co.
- Thomas C. Kirkwood (Firm)
- Thomas Cogger & Sons.
- Thomas Cogger (Firm)
- Thomas Cook Ltd.
- Thomas E. Haymaker Bulb Farm.
- Thomas E. Sheerin (Firm)
- Thomas F. McLoughlin (Firm)
- Thomas F. Seal (Firm)
- Thomas G. Newman & Son,
- Thomas H. Hughes (Firm)
- Thomas Hancock (Firm)
- Thomas Hogg (Firm)
- Thomas Holloway (Firm)
- Thomas J. Garden & Son.
- Thomas J. Garden (Firm)
- Thomas J. Grey & Co.
- Thomas J. Grey Co.
- Thomas J. Grey Company.
- Thomas J. Lane (Firm)
- Thomas J. Lane (Firm),
- Thomas J. Lane, Jr. (Firm)
- Thomas J. Murphy (Firm)
- Thomas Jefferson University.
- Thomas Kane & Co.
- Thomas L. Galvin (Firm),
- Thomas Leavitt (Firm)
- Thomas M. Proctor (Firm)
- Thomas M. Wood (Firm),
- Thomas Madsen & Co.
- Thomas Marks & Co.
- Thomas Marks & Son.
- Thomas Meehan & Sons.
- Thomas Meehan and Sons
- Thomas Meehan and Sons.
- Thomas Nurseries, Inc.
- Thomas Rogers & Sons Nurseries.
- Thomas Wood & Son, Inc.
- Thomas Wood & Sons Inc.,
- Thomas Young Nurseries Inc.
- Thomas, A.
- Thomas, A. P. W.
- Thomas, A. T.
- Thomas, Adrian,
- Thomas, Alain G. B.
- Thomas, Alice Frost
- Thomas, Allan E.
- Thomas, Anthony W.
- Thomas, Arianna
- Thomas, Arthur Caton, 1885-
- Thomas, B J
- Thomas, Barry A.
- Thomas, Ben
- Thomas, Benjamin Abraham, 1878-
- Thomas, Benjamin Franklin, 1853-
- Thomas, Benjamin Walden
- Thomas, Betsy Trent
- Thomas, Bijub B
- Thomas, Bindi
- Thomas, C. A.
- Thomas, C. C. (Cecil Calvert), 1886-1936
- Thomas, C. D.
- Thomas, C. E.
- Thomas, C. Edgar.
- Thomas, C. F. George
- Thomas, Carl B., Mrs.
- Thomas, Chantal
- Thomas, Charles D., Mrs.
- Thomas, Charles E. (Charles Eugene), 1940-
- Thomas, Charles W., 1903-1973
- Thomas, Clarke.
- Thomas, Craig
- Thomas, Craig J.
- Thomas, Cynthia
- Thomas, Cyrus, 1825-1910
- Thomas, D. P. (David P.)
- Thomas, Daniel C.
- Thomas, Daniela
- Thomas, David Evan
- Thomas, David H.
- Thomas, David Hurst.
- Thomas, David L. (David Laurence) 1942-
- Thomas, David Manning
- Thomas, David Morgan, 1841-
- Thomas, Don
- Thomas, Donald B.
- Thomas, Donald C.
- Thomas, Downs H.,
- Thomas, Duncan W.
- Thomas, E. J.
- Thomas, Edward Ellis, 1883-1936
- Thomas, Edward, 1878-1917
- Thomas, Erhard
- Thomas, Eric
- Thomas, Erin J.
- Thomas, Ethel N. 1876-1944
- Thomas, Fim
- Thomas, Florence I. M.
- Thomas, Frank
- Thomas, Frank M.
- Thomas, Friedrich
- Thomas, Friedrich August Wilhelm, 1840-1918
- Thomas, G E Venning
- Thomas, G.
- Thomas, G. A.
- Thomas, G. E. V.
- Thomas, Gabriel.
- Thomas, Geo. B.
- Thomas, Geo. C. (George Clifford), 1873-
- Thomas, George R., 1946-
- Thomas, Gerard M.
- Thomas, Ginger.
- Thomas, Gregory A.
- Thomas, Gwen Michele
- Thomas, H Hamshaw
- Thomas, H Wolferstan
- Thomas, H. Allen
- Thomas, H. E. (Harold Edgar), 1906-
- Thomas, H. Earl (Harvey Earl), 1890-1974
- Thomas, H. H. (Harry Higgott)
- Thomas, Harriet.
- Thomas, Henry Dighton
- Thomas, Henry Dighton, 1900-
- Thomas, Henry Sullivan.
- Thomas, Hollis A.,
- Thomas, Horace Leroy, 1903-
- Thomas, Howard
- Thomas, Howard H.
- Thomas, Howard, 1943-
- Thomas, Howell W.
- Thomas, Hugh Hamshaw
- Thomas, I. M.
- Thomas, Ivor.
- Thomas, J. A.
- Thomas, J. B.
- Thomas, J. E.
- Thomas, J. H.
- Thomas, J. H. (Entomologist)
- Thomas, J. J. (John Jacobs), 1810-1895
- Thomas, J. M.
- Thomas, J., 19th cent-
- Thomas, Jack Ward
- Thomas, Jacob
- Thomas, James
- Thomas, James A
- Thomas, James Darwin
- Thomas, Janelle L
- Thomas, Janis E.
- Thomas, Jean-Claude
- Thomas, Jenkin, active 1839-
- Thomas, Jennifer C.
- Thomas, Jeremy
- Thomas, Jerome B., 1867-
- Thomas, Joab L.
- Thomas, Jocelyn Parker
- Thomas, John Hunter, 1928-1999
- Thomas, John Sewell
- Thomas, Joseph
- Thomas, Joseph B. (Joseph Brown), 1879-1955
- Thomas, Joseph James.
- Thomas, Jules, active 1841-1852
- Thomas, Justin R.
- Thomas, K. K.
- Thomas, K. Raju
- Thomas, Kaleb J.,
- Thomas, Kate
- Thomas, Katherine M.
- Thomas, Kathryn
- Thomas, Kelly
- Thomas, Kiran
- Thomas, L.
- Thomas, Laurent
- Thomas, Le Marchant
- Thomas, Leonard A
- Thomas, Levi M. (Levi Morton), 1888-
- Thomas, Lilian A.
- Thomas, Linda
- Thomas, Linda A
- Thomas, Lowell P.
- Thomas, Lyell J
- Thomas, M. C. (Michael Charles), 1948-
- Thomas, M. Jared
- Thomas, M. K.
- Thomas, Margaret
- Thomas, Margaret G.
- Thomas, Martin L. H.
- Thomas, Mary Beth
- Thomas, Mason B.
- Thomas, Matthew R.
- Thomas, Meike & Frank Glaw.
- Thomas, Melissa L.
- Thomas, Micheli C.
- Thomas, Mike C
- Thomas, Mrs Rose Haig
- Thomas, N. D.
- Thomas, N. Wiley
- Thomas, Nancy J. (Nancy Jeanne), 1948-
- Thomas, Natalie
- Thomas, Neil D.
- Thomas, Nesta
- Thomas, Nikky M.
- Thomas, O. S.
- Thomas, Oldfield, 1858-1929
- THOMAS, Olivier
- Thomas, Owen D
- Thomas, Owen.
- Thomas, P.
- Thomas, P. D. (Paul Denis), 1935-
- Thomas, Paul
- Thomas, Paul A.
- Thomas, Peter A.
- Thomas, Phil.
- Thomas, Philip
- Thomas, Philippe, 1843-1919
- Thomas, R. Dale
- Thomas, R. G.
- Thomas, R. Glenn
- Thomas, R. J.
- Thomas, R. P.
- Thomas, R. William