- Portlock, Nathaniel, 1748?-1817
- Portman, Arthur F. B.
- Portman, Lodewyk Gotlieb, 1772-
- Portman, M V
- Portman, Richard
- Portman, Zach
- Portman, Zachary
- Portmann, A
- Portmann, Adolf, 1897-1982
- Portner, H O
- Portner, Talia
- PörtnerHans-Otto
- Portnoy, John W
- Porto Rico Agricultural Experiment Station.
- Porto, Ana Lúcia Figueiredo
- Porto, Danianne Enéias
- Porto, Daniel Brito
- Porto, Diego Sasso
- Porto, F. E.
- Porto, Gabriele R.
- Porto, Jorge I. R.
- Porto, Jorge Ivan Rebelo
- Porto, Juliana R.
- Porto, Karla R. A.
- Pôrto, Kátia Cavalcanti
- Porto, Louise
- Porto, Maria Luiza
- Porto, Marilena Ramos
- Porto, Miguel
- Porto, P Campos
- Porto, Tatiana Souza
- Porto, Tiago Jordão
- Porto, Willians
- Portocarrero, C A
- Porto-Foresti, F.
- Porto-Foresti, Fabio
- Porto-Foresti, Fábio
- Port-Rose Garden.
- Ports, M
- Ports, Mark A
- Portschinsky, J
- Portschinsky, J A
- Portugal Santana, André
- Portugal, Adriana Brizon
- Portugal, António
- Portugal.
- Portugal. Cortes.
- Portugal. Impressão Régia.
- Portugal. Junta da Administração do Tabaco.
- Portugal. Sovereign (1521-1557 : John III)
- Portugal. Sovereign (1640-1656 : John IV)
- Portugal. Sovereign (1750-1777 : Joseph)
- Portugal. Sovereign (1777-1816 : Maria I)
- Portus, A. B.
- Portus, Maria Isabel G.
- Portwood, Bruce E.
- Posa, Mary Rose C
- Posada Osorio, Santiago
- Posada P., Tibisay
- Posada R, William Andrés
- Posada, Blanca
- Posada, Blanca O.
- Posada, Camila
- Posada, Francisco
- Posada, Juan
- Posada, Santiago
- Posada-Arango, André
- Posada-Arango, M A
- Posada-F Francisco J
- Posada-Flórez, Francisco Javier
- Posada-Herrera, Juan Mauricio
- Posada-Peláez, Camila
- Posada-Posada, Blanca O
- Posadas, Paula
- Posamentier, Heimo
- Poscharsky, Gustav Adolf, 1832-
- Poschinger, Ferdinand von, 1898-1958
- Pöschl, Artur
- Poscolere, Grazielle Dias
- Poselger, H. (Heinrich), 1818-1883
- Posepny, Franz A
- Posey, Chesley Johnston, 1906-
- Posey, Darrell A.
- Posey, James B.
- Posey, Maryhelen.
- Posey, Walter Benjamin.
- Posnansky, Merrick.
- Posner, Jack.
- Posner, Michael I.
- Posos-Ponce, P
- Pospelov, Michael N.
- Poss, Stuart G
- Possebon Cyrino, José Eurico
- Posser, Pedro M.
- Posse-Sarmiento, Valentina
- Possette, Rafael Fernando da Silva
- Possevino, Antonio, 1533-1611
- Possimoser, Dalvan
- Possingham, Hugh
- Posso, Sérgio R.
- Posso, SR
- Posso, SR.
- Posson, Neil F
- Posson, R. J. (Rutherford Jay), 1890-
- Posson's Seed Store.
- Possum Hollow Nurseries,
- Post, Albert S.
- Post, Angela R
- Post, Arthur Edwin,
- Post, Boyd W.
- Post, Charles Johnson, 1873-1956
- Post, Charles T
- Post, D C
- Post, David C
- Post, E J
- Post, Frank M.
- Post, George E. (George Edward), 1838-1909
- Post, John R.
- Post, Karen E.
- Post, Katherine C
- Post, Peter W
- Post, R L
- Post, Richard L
- Post, Steve.
- Post, Thelma B
- Post, Thomas Erik von, 1858-1912
- Post, Tom Erik von
- Post, William
- Postal Microscopical Society.
- Postans, J
- Postans, Thomas
- Postans, W
- Postel, E
- Postel, Emil.
- Postel, Emile
- Postels, A. (Aleksandr), 1801-1871
- Postey, Rosemary
- Posthumus, P.
- Postiglioni, Rodrigo
- Postigo Mijarra, José María
- Postle, A C
- Postle, Anthony
- Postlethwait, John H
- Postlethwait, S N
- Postma, John, 1867-
- Postma, Lianne
- Postman, Joseph
- Postner, Martin
- Poston, Bert
- Poston, M E
- Poston, Muriel E
- Post's Nursery.
- Post'S Plant Nursery,
- Postupalsky, S
- Posy Bed,
- Poszig, Dörte
- Potanin, G. N. 1835-1920
- Potapov, Anton
- Potapov, E
- Potapov, Eugene R
- Potapov, Grigory
- Potapov, Mikhail
- Potapov, Mikhail B
- Potapov, R L
- Potapowicz, Maya
- Potarsky, Karina
- Potascheff, Carolina de Moraes
- Potash, Laura L.
- Potaufeu, Yann
- Potdar, G G
- Poteau, J., fl 1876-
- Potential Gas Agency.
- Potenza, Guido
- Potenza, Marco A C
- Poterč, Jasna
- Potes, Andrés
- Potgieter, Barent Jansz, 1574-
- Potgieter, Kurt
- Potgieter, Luke
- Potgieter, Martin
- Pothe De Baldis, E D
- Pothier, Oliver Louis, 1864-1926
- Poths, H
- Potier de la Varde, R. (Robert), 1878-1961
- Potier, P
- Potiez, Valéry Louis Victor.
- Potiguara, Raimunda Conceição de Vilhena
- Potlakayala, SD
- Potocsky, Gabriel J.
- Potomac-side Naturalists' Club.
- Potomati, Adriana
- Potonié, H. (Henry), 1857-1913
- Potonié, Robert. 1889-1974.
- Potoschi, Antonio
- Potrony Hechavarría, María
- Potrony Hechavarría, María Elena
- Potschin, Marion
- Potswald, Herbert E
- Pott, A
- Pott, A.
- Pott, Arnildo
- Pott, E
- Pott, J. F. (Johann Friedrich), 1738-1805
- Pott, Mrs R
- Pott, R
- Pott, Vali
- Pott, Vali J. (Vali Joana), 1946-
- Potteiger, Clarence Reuben,
- Pottenger, L. A.
- Potter & Clarke.
- Potter Nurseries,
- Potter Nursery.
- Potter, A. F.
- Potter, Albert F. (Albert Franklin), 1859-1944
- Potter, Alfred C.
- Potter, Alonzo, 1800-1865
- Potter, Benjamin
- Potter, Catherine
- Potter, Charles
- Potter, Christopher
- Potter, D
- Potter, Dale R.
- Potter, Dan
- Potter, Daniel
- Potter, Darryl G
- Potter, David
- Potter, David, 1894-1967
- Potter, Donald B., 1923-
- Potter, E C
- Potter, E. L. (Ermine Lawrence), 1884-
- Potter, E. W.
- Potter, Ermine Lawrence, 1884-
- Potter, George Edwin, 1898-
- Potter, George F.
- Potter, Harry B.
- Potter, I A N C
- Potter, I C
- Potter, James
- Potter, John
- Potter, Karen
- Potter, Kevin
- Potter, Laurence B.
- Potter, Lawrence E.
- Potter, Michael Cressé, 1858-1948
- Potter, Murray Anthony, 1871-1915
- Potter, Nathan S
- Potter, Nathaniel, 1770-1843
- Potter, Peter E
- Potter, Ralph S
- Potter, Sally