- Dendrobium paathii
- Dendrobium pachyanthum
- Dendrobium pachyglossum – Few-leaved Dendrobium
- Dendrobium pachyphyllum – Broad-stemmed Dendrobium
- Dendrobium pachystele
- Dendrobium pachythrix
- Dendrobium pahangense
- Dendrobium palawense
- Dendrobium palpebrae – Brow-like Dendrobium
- Dendrobium pandaneti
- Dendrobium panduratum
- Dendrobium panduratum ssp. panduratum
- Dendrobium panduratum ssp. villosum
- Dendrobium panduriferum
- Dendrobium paniferum
- Dendrobium pantherinum
- Dendrobium papilio
- Dendrobium papilioniferum
- Dendrobium papilioniferum var. ephemerum
- Dendrobium papuanum
- Dendrobium papyraceum – Paper-like Dendrobium
- Dendrobium paradoxum
- Dendrobium parciflorum
- Dendrobium parcoides
- Dendrobium parcum
- Dendrobium parishii – Parish's Dendrobium
- Dendrobium parnatanum
- Dendrobium parthenium
- Dendrobium parviflorum
- Dendrobium parvifolium
- Dendrobium parvilobum
- Dendrobium parvum
- Dendrobium paspalifolium
- Dendrobium patentifiliforme
- Dendrobium patentilobum
- Dendrobium patentissimum
- Dendrobium patulum
- Dendrobium pectinatum
- Dendrobium peculiare
- Dendrobium pedicellatum
- Dendrobium pedilochilum
- Dendrobium peguanum – Pegu Dendrobium
- Dendrobium pendulum – Pendant-growing Dendrobium
- Dendrobium pedunculatum (formerly D. speciosum var. pedunculatum)
- Dendrobium pensile
- Dendrobium pentapterum
- Dendrobium percnanthum
- Dendrobium pergracile
- Dendrobium perlongum
- Dendrobium perpaulum
- Dendrobium perula
- Dendrobium perulatum
- Dendrobium petiolatum – Stemmed Dendrobium
- Dendrobium petrophilum
- Dendrobium phalaenopsis – Cooktown Orchid (formerly D. bigibum var. phalaenopsis, D. bigibbum var. superbum)
- Dendrobium phaeanthum
- Dendrobium philippinense
- Dendrobium phillipsii
- Dendrobium phragmitoides
- Dendrobium pictum
- Dendrobium pierardii
- Dendrobium piestocaulon
- Dendrobium piestocaulon var. kauloense
- Dendrobium piestocaulon var. piestocaulon
- Dendrobium pinifolium
- Dendrobium piranha
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- Dendrobium planibulbe
- Dendrobium planicaule
- Dendrobium planum
- Dendrobium platybasis
- Dendrobium platygastrium – Broad-bellied Dendrobium
- Dendrobium plebejum
- Dendrobium pleianthum – Rich-blooming Dendrobium
- Dendrobium pleiostachyum
- Dendrobium pleurodes
- Dendrobium plumilobum
- Dendrobium podocarpifolium
- Dendrobium podochiloides
- Dendrobium pogonatherum
- Dendrobium pogoniates
- Dendrobium poissonianum
- Dendrobium polycladium
- Dendrobium polycladium var. atractoglossum
- Dendrobium polycladium var. polycladium
- Dendrobium polyphyllum
- Dendrobium polyschistum
- Dendrobium polyschistum var. graminiforme
- Dendrobium polyschistum var. marginatum
- Dendrobium polyschistum var. polyschistum
- Dendrobium polytrichum
- Dendrobium ponapense
- Dendrobium poneroides
- Dendrobium poneroides var. angustum
- Dendrobium poneroides var. poneroides
- Dendrobium porphyrochilum
- Dendrobium potamophila
- Dendrobium praecinctum
- Dendrobium praetermissum
- Dendrobium prasinum – Leek-green Dendrobium
- Dendrobium prenticeii (formerly D. lichenastrum var. prenticeii)
- Dendrobium prianganense
- Dendrobium × primulardii
- Dendrobium primulinum – Primrose-yellow Dendrobium
- Dendrobium pristinum
- Dendrobium procerum
- Dendrobium procumbens
- Dendrobium profusum
- Dendrobium prostheciglossum
- Dendrobium prostratum
- Dendrobium proteranthum
- Dendrobium pruinosum
- Dendrobium pseudoaloifolium
- Dendrobium pseudocalceolum
- Dendrobium pseudoconanthum
- Dendrobium pseudodichaea
- Dendrobium pseudoglomeratum – Pseudo-glomeratum Dendrobium
- Dendrobium pseudointricatum
- Dendrobium pseudopeloricum
- Dendrobium pseudotenellum
- Dendrobium pterocarpum
- Dendrobium puberulilingue
- Dendrobium pulchellum – Charming dendrobium
- Dendrobium pulleanum
- Dendrobium pulvinatum
- Dendrobium punamense
- Dendrobium puniceum
- Dendrobium purpureiflorum
- Dendrobium purpureum – Purple Dendrobium
- Dendrobium purpureum ssp. candidulum
- Dendrobium purpureum ssp. purpureum
- Dendrobium putnamii
- Dendrobium pycnostachyum
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