- Dendrobium takahashii
- Dendrobium tampangii
- Dendrobium tangerinum – Tangerine-coloured Dendrobium
- Dendrobium tapingense
- Dendrobium tapiniense – Tapini Dendrobium
- Dendrobium tarberi (formerly D. speciosum var. hillii)
- Dendrobium tattonianum (D. canaliculatum var. tattonianum)
- Dendrobium taurinum – Bull orchid
- Dendrobium taurinum var. amboinense
- Dendrobium taurinum var. taurinum
- Dendrobium taurulinum
- Dendrobium taveuniense
- Dendrobium teloense
- Dendrobium tenellum – Very Delicate Dendrobium
- Dendrobium tenue
- Dendrobium tenuicaule
- Dendrobium tenuissimum – "rattail orchid"
- Dendrobium terminale
- Dendrobium terrestre
- Dendrobium tetrachromum
- Dendrobium tetraedre
- Dendrobium tetragonum – Rectangular-bulbed dendrobium, Tree spider orchid, Common spider orchid
- Dendrobium tetralobum
- Dendrobium tetrodon
- Dendrobium tetrodon var. tetrodon
- Dendrobium tetrodon var. vanvuurenii
- Dendrobium thrysiflorum – Pinecone-raceme Dendrobium
- Dendrobium thysanophorum
- Dendrobium tobaense – Toba Dendrobium
- Dendrobium tokai
- Dendrobium torajaense – Toraja Dendrobium
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- Dendrobium toressae – Torres Strait Dendrobium
- Dendrobium torquisepalum
- Dendrobium torricellense
- Dendrobium torricellianum
- Dendrobium tortile – Twisted dendrobium
- Dendrobium tosaense
- Dendrobium toxopei
- Dendrobium tozerensis
- Dendrobium trachythece
- Dendrobium transparens – Translucent Dendrobium
- Dendrobium transtilliferum
- Dendrobium treubii
- Dendrobium triangulum
- Dendrobium trichosepalum
- Dendrobium trichostomum
- Dendrobium tricuspe
- Dendrobium tridentatum
- Dendrobium tridentiferum
- Dendrobium trigonellodorum
- Dendrobium trigonopus – Golden Chicken's Beak Orchid, Triangular-column-footed Dendrobium
- Dendrobium trilamellatum – Brown Antelope Orchid
- Dendrobium trilobulatum
- Dendrobium trinervium
- Dendrobium triste
- Dendrobium tropidoneuron
- Dendrobium trullatum
- Dendrobium truncatum
- Dendrobium truncicola
- Dendrobium tuananhii : Vietnam
- Dendrobium tubiflorum
- Dendrobium tumoriferum
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