- Dendrobium babiense
- Dendrobium baeuerlenii
- Dendrobium baileyi
- Dendrobium balzerianum
- Dendrobium bambusifolium
- Dendrobium bambusiforme
- Dendrobium bambusinum
- Dendrobium bandaense
- Dendrobium barbatulum – Small-bearded dendrobium
- Dendrobium barbatum
- Dendrobium barisanum
- Dendrobium basilanense
- Dendrobium beamanianum
- Dendrobium beckleri – Pencil Orchid
- Dendrobium bellatulum – Enchanting dendrobium
- Dendrobium bensoniae – Benson's Dendrobium
- Dendrobium bicallosum
- Dendrobium bicameratum
- Dendrobium bicaudatum – Two-tailed Dendrobium
- Dendrobium bicornutum
- Dendrobium bifalce
- Dendrobium bifarium
- Dendrobium biflorum
- Dendrobium bigibbum – Two-humped dendrobium
- Dendrobium bigibbum var. album
- Dendrobium bigibbum var. candicum
- Dendrobium bihamulatum
- Dendrobium bilobulatum
- Dendrobium bilobum
- Dendrobium biloculare
- Dendrobium binoculare
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- Dendrobium bipulvinatum
- Dendrobium bismarckiense
- Dendrobium blanche-amesiae
- Dendrobium blumei
- Dendrobium bostrychodes
- Dendrobium boumaniae
- Dendrobium bowmannii
- Dendrobium brachyanthum
- Dendrobium brachycalyptra
- Dendrobium brachycentrum
- Dendrobium brachypus – Norfolk Island Orchid (formerly D. gracilicaule var. brachypus)
- Dendrobium bracteosum – Bracted Dendrobium
- Dendrobium branderhorstii
- Dendrobium brassii
- Dendrobium brevicaudum
- Dendrobium brevicaule
- Dendrobium brevicaule ssp. brevicaule
- Dendrobium brevicaule ssp. calcarium
- Dendrobium brevicaule ssp. pentagonum
- Dendrobium brevilabium
- Dendrobium brevimentum
- Dendrobium brunnescens
- Dendrobium brymerianum – Brymer's dendrobium
- Dendrobium buffumii
- Dendrobium bukidnonense
- Dendrobium bulbophylloides – Bulbophyllum-like Dendrobium
- Dendrobium bullenianum – Bullen's Dendrobium
- Dendrobium bunuanense
- Dendrobium busuangense
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