- Dendrobium wardianum – Ward's Dendrobium
- Dendrobium wassellii
- Dendrobium wattii
- Dendrobium wentianum
- Dendrobium wenzelii – Wenzel's Dendrobium
- Dendrobium whistleri
- Dendrobium wightii
- Dendrobium williamsianum – Williams' Dendrobium
- Dendrobium williamsianum var. chanii
- Dendrobium williamsianum var. williamsianum
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- Dendrobium williamsonii – Williamson's dendrobium
- Dendrobium wilmsianum
- Dendrobium wilsonii
- Dendrobium wisselense
- Dendrobium wolterianum
- Dendrobium woluense
- Dendrobium womersleyi
- Dendrobium woodsii
- Dendrobium wulaiense – Wulai Island White Orchid
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