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- Parsons Wholesale Nursery.
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- Partington, Charles Frederick, 1857?
- Partington, Frederick E., 1924
- Partners for Fish and Wildlife Program (U.S. Fish and Wildlife Service),
- Partners in Amphibian and Reptile Conservation.
- Partners in Flight. Western Working Group.
- Partners in Protection (Canada)
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- Parvin, Theodore Sutton, 1817-1901
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- Pascha'S, Emin
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- Pascher, Adolf
- Pascher, Adolf, 1881-1945
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- Paschoal, Lucas R.P.
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- Pasciuti, Louis
- Pasciuti, V. James
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- Pascual, Amelia Díaz De
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- Pascual, Miguel A.
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- Pascualidades, A.
- Pascual-Toca Marta
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- Pase, C.P.
- Pase, Charles P.
- Pase, H A
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- Pasechnik, Dmitrii
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- Pasek, Kamil
- Pasek, William
- Paseto, Á
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- Paseur, G
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- Pasha, M K S
- Pasha, Mohd Khalid S
- Pashaei Rad, Shahrokh
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- Pasheva, Evdokia
- Pashkevich, Svetlana G.
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- Pasieczny, Amelia
- Pasierbski, Zdzisław
- Pasin, Liliana Auxiliadora Avelar Pereira
- Pasini, A.
- Pasini, Amarildo
- Pasini, Carlo, 18th cent-
- Pasini, Eduardo
- Pasini, Giovanni
- Pasini, Mario
- Pasitschniak-Arts, Maria
- Paskewitz, S M
- Pasko, John
- Paskoff, Roland
- Pasmans, Frank
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- Paśnik, Grzegorz
- Paso Viola, M. Natalia
- Pasorn, Pattana
- Paso-Viola, María Natalia
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- Pasquali, Jo. Baptist. (Venetie??)
- Pasqualotto, Nielson