• Pyrus Linnaeus, 1753 [Family: Rosaceae]
• Pyrus Webster, 1814 † (uncertain) [Family: Mollusca (awaiting allocation)]
• Pyrus acerba (Mérat) DC. accepted as Malus sylvestris (L.) Mill.
• Pyrus acerba (Mérat) Lej.
• Pyrus achras Boreau
• Pyrus achras Delarbre
• Pyrus achras Gaertn. (unaccepted)
• Pyrus achras Morog.
• Pyrus acidula Nakai
• Pyrus acutiloba Ilse
• Pyrus acutiserrata Gladkova
• Pyrus aequalis A. Sav.
• Pyrus aestivalis Lamotte
• Pyrus albicans Kit.
• Pyrus albicans Poit. & Turpin
• Pyrus alnifolia (Siebold & Zucc.) Franch & Sav. (unaccepted)
• Pyrus alnifolia Lindl.
• Pyrus alpina (Mill.) Du Roi
• Pyrus alpina F. Schmidt
• Pyrus alpina Willd.
• Pyrus amaena Poit. & Turpin
• Pyrus ambigua Beck
• Pyrus ambrosiaca Poit. & Turpin
• Pyrus amelanchier (L.) Du Roi
• Pyrus amelanchier (L.) L. f. accepted as Amelanchier ovalis Medik.
• Pyrus amelanchier hort. ex K. Koch
• Pyrus americana (Marshall) DC. accepted as Sorbus americana Marshall
• Pyrus americana S. Watson & J.M. Coult. accepted as Sorbus americana Marshall
• Pyrus amoena Koidz.
• Pyrus amoena Poit. & Turpin
• Pyrus amoris Poit. & Turpin
• Pyrus amphigenea Domin ex Dostalek
• Pyrus amurensis (Koehne) Cardot
• Pyrus amygdaliformis Vill.
• Pyrus amygdaloides Link accepted as Pyrus amygdaliformis Vill.
• Pyrus anatolica Browicz
• Pyrus angeli Poit. & Turpin
• Pyrus anglica Druce
• Pyrus anglica Poit. & Turpin
• Pyrus angulata Kit. ex Rochel
• Pyrus angustifolia Aiton accepted as Malus angustifolia (Aiton) Michx.
• Pyrus angustifolia Decne.
• Pyrus anthyllidifolia Sm. accepted as Osteomeles anthyllidifolia (Sm.) Lindl.
• Pyrus apetala Münchh.
• Pyrus apiosa hort. ex Steud.
• Pyrus apyrena Poit. & Turpin
• Pyrus aquosa Poit.
• Pyrus arachnoidea (Koehne) Bennet
• Pyrus arakiana Koidz.
• Pyrus arbutifolia (L.) L. f. accepted as Photinia pyrifolia (Lam.) K.R. Robertson & J.B. Phipps
• Pyrus arctica hort. ex K. Koch
• Pyrus ardenponti Poit. & Turpin
• Pyrus arenbergia Poit. & Turpin
• Pyrus arenbergii Poit. & Turpin
• Pyrus arguta Tausch
• Pyrus argyrophylla Diap. accepted as Pyrus salicifolia Pall.
• Pyrus aria (L.) Ehrh. accepted as Sorbus aria (L.) Crantz
• Pyrus aria Brandis
• Pyrus aria Hook. f. & Thomson ex Hook. f.
• Pyrus aria Moench
• Pyrus aria Wimm. & Grab.
• Pyrus arioides Griff.
• Pyrus arioides H. Lév.
• Pyrus armeniacaefolia Dochnahl
• Pyrus armeniacaefolia T.T. Yu
• Pyrus armud Hausskn. & Bornm.
• Pyrus arnoldiana (Rehder) Bean accepted as Malus arnoldiana (Rehder) Rehder
• Pyrus aromatica Kikuchi & Nakai (unaccepted)
• Pyrus arranensis Druce
• Pyrus arsenii (Britton) L. Arsène
• Pyrus asakeensis Koidz.
• Pyrus asiaemediae (Popov) Maleev
• Pyrus asiaemediae Popov
• Pyrus astateria Cardot accepted as Sorbus astateria (Cardot) Hand.-Mazz.
• Pyrus astracanica DC.
• Pyrus atropurpurea (Britton) L.H. Bailey accepted as Photinia floribunda (Lindl.) K.R. Robertson & J.B. Phipps
• Pyrus atrosanguinea Späth
• Pyrus atrovirens hort. ex K. Koch accepted as Sorbus rotundifolia (Bechst.) Hedl.
• Pyrus aucuparia (L.) Gaertn. accepted as Sorbus aucuparia Linnaeus
• Pyrus aucuparia E. Mey.
• Pyrus aucuparia Ehrh.
• Pyrus aucuparioides H. Lév.
• Pyrus augustii Poit. & Turpin
• Pyrus aurantiacum Durand & B.D. Jacks. accepted as Pyrus aurantium Poit. & Turpin
• Pyrus aurantium Poit. & Turpin
• Pyrus aureola Poit. & Turpin
• Pyrus auricularis Knoop
• Pyrus auriculata DC.
• Pyrus austriaca A. Kern.
• Pyrus autumnalis (Siebold) Koidz.
• Pyrus azarolus (L.) Scop. accepted as Crataegus azarolus Linnaeus
• Pyrus babadagensis Prodán
• Pyrus babauttiagi Koidz.
• Pyrus baccata (Desf.) Hemsl.
• Pyrus baccata Brandis
• Pyrus baccata hort. ex Hoffmanns.
• Pyrus baccata P. Watson
• Pyrus baccata Thunb.
• Pyrus badensis hort. ex K. Koch
• Pyrus balansae Decne.