• Piper Linnaeus, 1753
• Piper aducum Linnaeus
• Piper aduncum Linnaeus
• Piper aequale Vahl
• Piper amalago Linnaeus
• Piper angustifolium Lam.
• Piper angustilimbum C. Dc.
• Piper auritum Kunth
• Piper betel Linnaeus
• Piper blattarum Spreng.
• Piper caracasanum Bredem
• Piper citrifolium Lam. accepted as Piper jacquemontianum Kunth
• Piper cubeba L. f.
• Piper dilatatum L.C. Rich.
• Piper emarginellum Sw. ex Wikstr. accepted as Peperomia emarginella (Sw. ex Wikstr.) C. DC.
• Piper glabellum Sw. accepted as Peperomia glabella (Sw.) A. Dietr.
• Piper glabrescens (Miq.) C. DC.
• Piper guayranum C. Dc.
• Piper guineense Schumacher & Thonn.
• Piper hernandiifolium Vahl accepted as Peperomia hernandiifolia (Vahl) A. Dietr.
• Piper hispidum Sw.
• Piper humile Vahl accepted as Peperomia humilis A. Dietr.
• Piper jacquemontianum Kunth
• Piper lambeauense C. Dc.
• Piper leptostachyon Nutt. accepted as Peperomia humilis A. Dietr.
• Piper longifolium Ruiz & Pavon
• Piper longum Linnaeus
• Piper maculosum Linnaeus accepted as Peperomia maculosa (L.) Hook.
• Piper marginatum Jacq.
• Piper methysticum G. Forst.
• Piper mornicola C. Dc.
• Piper nigrum Linnaeus
• Piper obtusifolium Linnaeus accepted as Peperomia obtusifolia (L.) A. Dietr.
• Piper officinarum (Miq.) C. DC. accepted as Piper retrofractum Vahl
• Piper ornatum N.E. Br.
• Piper pellucidum Linnaeus accepted as Peperomia pellucida (L.) Kunth
• Piper peltatum Linnaeus accepted as Lepianthes peltata (L.) Raf.
• Piper ponapense C. DC.
• Piper quadrifolium Linnaeus accepted as Peperomia quadrifolia (L.) Kunth
• Piper reticulatum Linnaeus
• Piper retrofractum Vahl
• Piper rotundifolium Linnaeus accepted as Peperomia rotundifolia (L.) Kunth
• Piper saltuum C. Dc.
• Piper scabrum Sw. accepted as Piper hispidum Sw.
• Piper serpens Sw. accepted as Peperomia serpens (Sw.) Loud.
• Piper swartzianum (Miq.) C. DC.
• Piper tenellum Sw. accepted as Peperomia tenella (Sw.) A. Dietr.
• Piper tetraphyllum G. Forst. accepted as Peperomia tetraphylla (G. Forst.) Hook. & Arn.
• Piper treleaseanum Britt. & Wilson accepted as Piper glabrescens (Miq.) C. DC.
• Piper tuberculatum auct. non Jacq. accepted as Piper swartzianum (Miq.) C. DC.
• Piper umbellatum Linnaeus accepted as Lepianthes peltata (L.) Raf.
• Piper wydlerianum (Miq.) C. DC. accepted as Piper jacquemontianum Kunth
• Piper yellow mottle virus
• Piperaceae Giseke, 1792
• Piperales
• Piperamarginella Veldsman, 2017 accepted as Marginella Lamarck, 1799
• Piperanthera A.C. de Candolle, 1923
• Piperella (K.B. Presl ex H.G.L. Reichenbach) Spach, 1840 (uncertain) [Family: Lamiaceae, Phylum: Tracheophyta]
• Piperella Mayer, 1903 (uncertain) [Family: Crustacea (awaiting allocation), Phylum: Arthropoda]
• Piperella Odin, 2008 † [Family: , Phylum: Calcitarcha]
• Piperia Rydberg, 1901 accepted as Platanthera L.C. Richard, 1817
• Piperia candida R. Morgan & Ackerman
• Piperia colemanii R. Morgan & Glicenstein
• Piperia cooperi (S. Wats.) Rydb.
• Piperia elegans (Lindl.) Rydb.
• Piperia elongata Rydb.
• Piperia lancifolia Rydb. accepted as Piperia elongata Rydb.
• Piperia leptopetala Rydb. accepted as Piperia elongata Rydb.
• Piperia longispica Dur. accepted as Piperia elongata Rydb.
• Piperia maritima (Greene) Rydb. accepted as Piperia elegans (Lindl.) Rydb.
• Piperia michaelii (Greene) Rydb.
• Piperia multiflora Rydb. accepted as Piperia elegans (Lindl.) Rydb.
• Piperia transversa Suksdorf
• Piperia unalascensis (Spreng.) Rydb.
• Piperia yadonii R. Morgan & Ackerman
• Piperiphorum Necker ex Rafinesque, 1838 (uncertain)
• Piperis Casey, 1922
• Piperites Göppert, 1854 † (uncertain)
• Piperius Hopkins, 1915 accepted as Cryphalus Erichson, 1836
• Piperivora Siboe, P.M. Kirk & P.F. Cannon, 1999
• Piperivora nodosa Siboe, P.M. Kirk & P.F. Cannon, 1999
• Piperivorus Bonaparte, 1854 (uncertain)
• Piperodendron Heister ex Fabricius, 1759 (uncertain)
• Piperodinium Mudie in Scott, Mudie, Vilks & Younger, 1984 †
• Piperodinium perplexum Mudie in Scott et al., 1984 †