- Pachliopta Reakirt 1865
- Pachycondyla Smith 1858
- Pachyneuron Walker 1833
- Pachyprotasis Hartig 1837
- Pachyseris Milne-Edwards & Haime 1849
- Padus (Miller) Turczaninow
- Paederia Linné
- Pagrus Cuvier 1816
- Paguma Gray 1831
- Paguristes Dana 1851
- Pagurixus Melin 1939
- Pagurus Fabricius 1775
- Palaemon Weber 1795
- Palaumysis Băcescu & Iliffe 1986
- Palola Gray 1847
- Panagaeus Latreille 1802
- Pandaka Herre 1927
- Pandalus Leach 1814 in Leach 1813-1814
- Pandanus Parkinson
- Pandeopsis Kramp 1959
- Panesthia Serville 1831
- Pangasianodon Chevey 1931
- Pantala Hagen 1861
- Panthera Oken 1816
- Panulirus White 1847
- Paphia Röding 1798
- Papilio Linnaeus 1758
- Paracaprella Mayer 1890
- Parablennius Miranda-Ribeiro 1915
- Parabolitobius Li, Zhao & Sakai 2000
- Parabotia Dabry de Thiersant 1872
- Parabucephalopsis Tang & Tang 1963
- Paracamptus Chappuis 1929
- Paracaristius Trunov, Kukuev & Parin 2006
- Paracentropogon Bleeker 1876
- Paracercion Weekers & Dumont 2004
- Parachaeturichthys Bleeker 1874
- Parachauliodes van der Weele 1909
- Parachordodes Camerano 1897
- Paracrenosoma Yun & Kontramavichus 1963
- Paracuaria Krishna Rao 1951
- Paracyathus Milne Edwards & Haime 1848
- Paracyclopina Smirnov 1935
- Paracyclops Claus 1893
- Paradexamine Stebbing 1899
- Paradiplogrammus Nakabo 1982
- Paradujardinia Travassos 1933
- Paraergasilus Markevich 1937
- Parafilaria Yorke & Maplestone 1926
- Parafilaroides Dougherty 1946
- Paragonimus Braun 1899
- Paragordius Camerano 1897
- Paraisocoelium Ozaki 1932
- Parajulis Bleeker 1865
- Parakaliella Habe 1946
- Paralabella Steinmann 1990
- Paralamprops Sars 1887
- Paralepas Pilsbry 1907
- Paralepidonotus Horst 1915
- Paraleucon Calman 1907
- Paraleucophenga Hendel 1914
- Paralichthys Girard 1858
- Parallorchestes Shoemaker 1941
- Paralophaster Fisher 1940
- Paralophogaster Hansen 1910
- Paralovenia Bouillon 1984
- Parambassis Bleeker 1874
- Paramblynotus Cameron 1908
- Paramecium Müller 1773
- Paramichailocoris Yasunaga 2007
- Paramisgurnus Dabry de Thiersant 1872
- Paramonacanthus Bleeker 1865
- Paramycodrosophila Duda 1924
- Paranebalia Claus 1880
- Paranthias Guichenot 1868
- Paraparatrechina Donisthorpe 1947
- Parapercis Bleeker 1863
- Paraplagusia Bleeker 1865
- Paraplea Esaki & China 1928
- Parapleustes Buchholz 1874
- Parapriacanthus Steindachner 1870
- Paraprionospio Caullery 1914
- Parapristipoma Bleeker 1873
- Paraprotella Mayer 1903
- Parapterois Bleeker 1876
- Parascaris Yorke & Maplestone 1926
- Parascolopsis Boulenger 1901
- Parasesarma de Man 1895
- Parashorea Kurz
- Parasitala Thiele 1931
- Paraspania Steinmann 1985
- Parastrongyloides Morgan 1928
- Paratachys Casey 1918
- Paratrechina Motschoulsky 1863
- Paratya Miers 1882
- Parazoogenetes Habe 1956
- Pardosa C.L. Koch 1847
- Parena Motschulsky 1859
- Parenchelyurus Springer 1972
- Parhyale Stebbing 1897
- Parides Hübner 1819
- Parioglossus Regan 1912
- Pariphinotus Kunkel 1910
- Parupeneus Bleeker 1863
- Parus Linnaeus 1758
- Paruterina Fuhrmann 1906
- Parvatrema Cable 1953
- Pasiphaea Savigny 1816
- Paspalum Linné
- Passaloecus Shuckard 1837
- Passalurus Dujardin 1845
- Passer Brisson 1760
- Patelloida Quoy & Gaimard 1834
- Patinopecten Dall 1898
- Patiriella Verrill 1913
- Patrinia Jussieu
- Pavo Linnaeus 1758
- Pavona Lamarck 1801
- Peasiella G. Nevill 1885
- Pecten O.F. Müller 1776
- Pectenophilus Nagasawa, Bresciani & Lützen 1988
- Pedotrina Arimoto 1978
- Pelagodiscus Dall 1908
- Peleteobagrus Bleeker 1865
- Peltodytes Regimbart 1878
- Pempheris Cuvier 1829
- Pemphredon Latreille 1796
- Penaeopsis Bate 1881
- Penaeus Fabricius 1798
- Pennaria Goldfuss 1820
- Pennisetum L.C. Richard
- Pentaceraster Döderlein 1916
- Pentagonica Dana 1851
- Pentalagus Lyon 1904
- Pentapodus Quoy & Gaimard 1824
- Pentaprion Bleeker 1850
- Pentias Richardson 1904
- Peponocyathus Gravier 1915
- Peranema Dujardin 1841
- Pericharax Poléjaeff 1883
- Periclimenes O.G. Costa 1844
- Perigona Laporte 1835
- Perigonimus M. Sars 1846
- Perileptus Schaum 1860
- Perinereis Kinberg 1866
- Perineura Hartig 1837
- Periophthalmus Bloch & J.G. Schneider 1801
- Periplaneta Burmeister 1838
- Perisesarma de Man 1895
- Peristedion Lacépède 1801
- Perithous Holmgren 1859
- Perkinsus Levine 1978
- Perla Geoffroy 1762
- Perna Philipsson 1788
- Peromyscus Gloger 1841
- Peronella Gray 1855
- Peronia Fleming 1822
- Peronomerus Schaum 1854
- Persicaria Miller 1754
- Pesceus Özdikmen 2008
- Petaurista Link 1795
- Petricola Lamarck 1801
- Petrophilus Chaudoir 1838
- Petroscirtes Rüppell 1830
- Petromyzon Linnaeus 1758
- Phacosoma Jukes-Browne 1912
- Phaedusa H. & A.Adams 1855
- P. (Stereophaedusa)
- Phaeohelix Kuroda & Habe 1949
- Phaiomys Blyth 1863
- Phalacrocidaris Lambert 1902
- Phalacrocorax Brisson 1760
- Phania Meigen 1824
- Pharurus Leuckart 1848
- Phascolarctos de Blainville 1816
- Phasianus Linnaeus 1758
- Pheidole Westwood 1839
- Phelotrupes Jekel 1866
- Phenacolepas Pilsbry 1891
- Phenacoscorpius Fowler 1938
- Pherecardia Horst 1886
- Pheretima Kinberg 1867
- Pheropsophus Solier 1833
- Philidris Shattuck 1992
- Philoconcha Yamaguti 1936
- Philometra Costa 1845
- Philometroides Yamaguti 1935
- Philonema Kuitunen-Ekbaum 1933
- Philonthus Stephens 1829
- Philyra Learch 1817
- Phocascaris Höst 1932
- Phodopus Miller 1910
- Phoenicurus T. Forster 1817
- Pholis Scopoli 1777
- Phonias Gozis 1886
- Phormosoma Thomson 1872
- Phoronis Wright 1856
- Phoronopsis Gilchrist 1907
- Phortica Schiner 1862
- Phorticella Duda 1924
- Phoxinus Rafinesque 1820
- Phragmites Adanson
- Phrixocephalus Wilson C.B. 1908
- Phylladiorhynchus Baba 1969
- Phyllodoce Lamarck 1818 (Polychaeta)
- Phyllodoce Salisbury 1806 (Angiosperm)
- Phylloecus Newman 1838
- Phyllognathopus Mrázek 1893
- Phylloscopus F. Boie 1826
- Phyllospadix W.J. Hooker 1838
- Phyllostachys Siebold & Zucc.
- Phymatocera Dahlbom 1835
- Physa Draparnaud 1801
- Physaloptera Rudolphi 1819
- Physiculus Kaup 1858
- Physocephalus Diesing 1861
- Picea Miller
- Pictothyris Thomson 1927
- Pieris Schrank 1801
- Pillucina Pilsbry 1921
- Pimpla Fabricius 1804
- Pinctada Röding 1798
- Pinnotheres Latreille 1802
- Pinus Linné
- Pipistrellus Kaup 1829
- Pirothyris Thomson 1927
- Piscicola Blainville 1818
- Pisodonophis Kaup 1856
- Pison Jurine 1808
- Pista Malmgren 1866
- Pistacia Linné
- Pitymys McMurtrie 1831
- Placamen Iredale 1925
- Placiphorella Dall 1879
- Plagiolepis Mayr 1861
- Plagioporus Stafford 1904
- Plagiopsetta Franz 1910
- Plagiotremus Gill 1867
- Plagusia Latreille 1804
- Planchonella Pierre
- Planetes W.S. MacLeay 1825
- Planocera Blainville 1828
- Plantago Linné
- Plasmodium Marchiafava & Celli 1885
- Platambus Thomson 1859
- Platax Cuvier 1816
- Plateumaris Thomson 1866
- Platichthys Girard 1854
- Platidia Costa 1852
- Platorchestia Bousfield 1982
- Platybdella Malm 1863
- Platyberyx Zugmayer 1911
- Platycephalus Bloch 1795
- Platycerus Geoffroy 1762
- Platycodon
- Platygobiopsis Springer & Randall 1992
- Platygyra Ehrenberg 1834
- Platymetopus Dana 1851
- Platynus Bonelli 1810
- Platypleura Amyot & Serville 1843
- Platyrhina Müller & Henle 1838
- Platyxiphydria Takeuchi 1938
- Plecoglossus Temminck & Schlegel 1846
- Plecotus Geoffroy 1818
- Plectorhinchus Lacépède 1801
- Plectranthias Bleeker 1873
- Plectroglyphidodon Fowler & Ball 1924
- Plectropomus Oken 1817
- Pleioblastus Nakai
- Plesionika Spence Bate 1888
- Plesiopenaeus Bate 1881
- Plesiophthalmus Motschoulsky 1858
- Plesiops Oken 1817
- Plestiodon A.M.C. Duméril & Bibron 1839
- Pleurobrachia Fleming 1822
- Pleuronectes Linnaeus 1758
- Pleuronichthys Girard 1854
- Pleuroploca P. Fischer 1884
- Pleurosicya Weber 1913
- Pleusymtes Barnard 1969
- Ploesoma Herrick 1885
- Ploiaria Scopoli 1786
- Plotosus Lacépède 1803
- Pneumospirura Wu & Hu 1938
- Pocillopora Lamarck 1816
- Podiceps Latham 1787
- Podisma Berthold 1827
- Podocarpus Persoon
- Poecilasma Darwin 1852
- Poecile Kaup 1829
- Poecilia Bloch & J.G. Schneider 1801
- Poecilochaetus Claparède in Ehlers 1875
- Poecilopsetta Günther 1880
- Poecilus Bonelli 1810
- Polistes Latreille 1802
- Polyarthra Ehrenberg 1834
- Polycheles Heller 1862
- Polydora Bosc 1802
- Polydorella Augener 1914
- Polyergus Latreille 1804
- Polygonum Linné 1753
- Polypylis Pilsbry 1906
- Polyrhachis F. Smith 1857
- Polystomammina Seiglie 1965
- Polytrichium Hedwig
- Pomacea Perry 1810
- Pomacentrus Lacepède 1802
- Pomadasys Lacépède 1802
- Pomatoschistus Gill 1863
- Pomatostegus Schmarda 1861
- Ponera Latreille 1804
- Pontiometra A.H. Clark 1907
- Pontobdella Leach 1815
- Pontogeneia Boeck 1871
- Populus Linné
- Poraster Döderlein 1916
- Porcellanopagurus Filhol 1885
- Porites Link 1807
- Porocottus Gill 1859
- Porrocaecum Railliet & Henry 1915
- Potamogeton Linné
- Potentilla Linné
- Poteriostomum Quiel 1919
- Pottsiscalisetosus Pettibone 1969
- Praealticus Schultz & Chapman 1960
- Praomys Thomas 1915
- Prellicana Mayer 1903
- Priacanthus Oken 1817
- Primula Linné
- Priolepis Cuvier & Valenciennes 1837
- Prionace Cantor 1849
- Prionopelta Mayr 1866
- Prionospio Malmgren 1867
- Prionurus Lacépède 1804
- Priophorus Dahlbom 1835
- Pristaulacus Kieffer 1900
- Pristigenys Agassiz 1835
- Pristomyrmex Mayr 1866
- Pristosia Motschulsky 1865
- Proboscidactyla Brandt 1835
- Probstmayria Ransom 1907
- Procamallanus Baylis 1923
- Procambarus Ortmann 1905
- Procampylaspis Bonnier 1896
- Proceratium Roger 1863
- Proctoeces Odhner 1911
- ?Proparacaprella
- Proreinia Thiele 1931
- Prosopocoilus Westwood 1845
- Prosorhynchoides Dollfus 1929
- Protaetia Burmeister 1842
- Protanilla Taylor 1990
- Protella Dana 1853
- Proteocephalus Weinland 1858
- Protocirrineris Czerniavsky 1881
- Protogeton Mayer 1903
- Protohermes van der Weele 1907
- Protohyale Bousfield & Hendrycks 2002
- Protomima Mayer 1903
- Protoreaster Döderlein 1916
- Protospirura Seurat 1914
- Protostrongylus Kamensky 1905
- Protothaca Dall 1902
- Prototritella Arimoto 1977
- Protula Risso 1826
- Prunus Linné
- Psalidopus Wood-Mason in Wood-Mason & Alcock 1892
- Psammocora Dana 1846
- Psammoperca Richardson 1848
- Psenopsis Gill 1863
- Psenulus Kohl 1897
- Psettina Hubbs 1915
- Pseudaesopia Chabanaud 1934
- Pseudamophilus Bollow 1940
- Pseudanchialina Hansen 1910
- Pseudanthias Bleeker 1873
- Pseudisobrachium Kieffer 1904
- Pseudoacanthocephalus Petrochenko 1958
- Pseudobagrus Bleeker 1858
- Pseudobalistes Bleeker 1865
- Pseudoblennius Temminck & Schlegel 1850
- Pseudocapillaria Freitas 1959
- Pseudocaranx Bleeker 1863
- Pseudocardium Gabb 1866
- Pseudocentrotus Mortensen 1903
- Pseudoceros Lang 1884
- Pseudocoris Bleeker 1862
- Pseudocrangonyx Akatsuka & Komai 1922
- Pseudoctomeris Poltarukha 1996
- Pseudogobio Bleeker 1860
- Pseudogobius Popta 1922
- Pseudojuloides Fowler 1949
- Pseudolabrus Bleeker 1862
- Pseudolamprops Gamô 1989
- Pseudolasius Emery 1887
- Pseudolitomosa Yamaguti 1941
- Pseudomyicola Yamaguti 1936
- Pseudonereis Kinberg 1866
- Pseudoophonus Motschulsky 1844
- Pseudophilyra Miers 1879
- Pseudophycis Günther 1862
- Pseudophysaloptera Baylis 1934
- Pseudopleuronectes Bleeker 1862
- Pseudoprotella Mayer 1890
- Pseudoproto Mayer 1903
- Pseudorasbora Bleeker 1860
- Pseudorhombus Bleeker 1862
- Pseudosasa
- Pseudoscaphirhynchus A. M. Nikolskii 1900
- Pseudostrigea Yamaguti 1933
- Pseudoterranova Mozgovoi 1951
- Pseudothemis Kirby 1889
- Pseudotroglotrema Yamaguti 1971
- Psilocera Walker 1833
- Psilogramma Rothschild & Jordan 1903
- Psychotria Linné
- Pteragogus Peters 1855
- Ptereleotris Gill 1863
- Pteria Scopoli 1777
- Pterobdella Kaburaki 1921
- Pterocaesio Bleeker 1876
- Pterocarya Nuttall ex Moquin-Tandon
- Pterogobius T.N. Gill 1863
- Pterois Oken 1817
- Pteromalus Swederus 1795
- Pteroplatytrygon Fowler 1910
- Pteropurpura Jousseaume 1880
- Pteropus Erxleben 1777
- Pterosagitta Costa 1869
- Pterostichus Bonelli 1810
- P. (Badistrinus)
- P. (Hypherpes)
- P. (Japeris)
- P. (Koreonialoe)
- P. (Lianoe)
- P. (Melanius)
- P. (Morphnosoma)
- P. (Nialoe)
- P. (Omaseus)
- P. (Petrophilus)
- P. (Phonias)
- Pterygodermatites Wedl 1861
- Pterygoplichthys T.N. Gill 1858
- Ptilohyale Bousfield & Hendrycks 2002
- Pueraria de Candolle
- Pungitius Coste 1848
- Pungtungia Herzenstein 1892
- Pupinella Baird 1850
- Pupisoma Stoliczka 1873
- Purpura Bruguière 1789
- Purpuricenus Dejean 1821
- Pygeretmus Gloger 1841
- Pygidiopsis Looss 1907
- Pylopaguropsis Alcock 1905
- Pyramica Roger 1862
- Pyrgiscilla Laws 1937
- Pyrgiscus Philippi 1841
- Pyrgoma Leach 1818
- Pyura Molina 1782
- Pyxidea