- Dendrobium laceratum
- Dendrobium lacteum – Milk-white Dendrobium
- Dendrobium laevifolium – Shiny-leaved Dendrobium
- Dendrobium lagarum
- Dendrobium lanuginosum
- Dendrobium lambii
- Dendrobium lamellatum – Laminae Dendrobium
- Dendrobium lamelluliferum
- Dendrobium lamii
- Dendrobium lampongense
- Dendrobium lamprocaulon
- Dendrobium lamproglossum
- Dendrobium lamrianum
- Dendrobium lamyaiae
- Dendrobium lanceolatum
- Dendrobium lancifolium – Sword-leaved Dendrobium
- Dendrobium lancilabium
- Dendrobium lancilobum
- Dendrobium langbianense
- Dendrobium lankaviense
- Dendrobium lanyaiae
- Dendrobium lasianthera – Wooly Pollina Dendrobium
- Dendrobium lasioglossum
- Dendrobium latelabellatum
- Dendrobium laterale
- Dendrobium latifrons
- Dendrobium laurensii
- Dendrobium × lavarackianum
- Dendrobium lawesii – Lawes' Dendrobium, Christmas-bell Orchid
- Dendrobium lawiense
- Dendrobium laxiflorum
- Dendrobium leeanum
- Dendrobium leonis – Lion-like Dendrobium
- Dendrobium leontoglossum
- Dendrobium lepidochilum
- Dendrobium lepoense
- Dendrobium leporinum
- Dendrobium leptocladum
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- Dendrobium leucochlorum
- Dendrobium leucocyanum – White-and-blue Dendrobium
- Dendrobium leucohybos
- Dendrobium levatii
- Dendrobium leytense
- Dendrobium lichenastrum
- Dendrobium lichenicola
- Dendrobium limii
- Dendrobium linawianum
- Dendrobium lindleyi – Lindley's Dendrobium (formerly D. aggregatum)
- Dendrobium lineale – Morobe Shower
- Dendrobium linearifolium
- Dendrobium linguella
- Dendrobium lithicola (formerly D. bigibbum var. compactum)
- Dendrobium litorale
- Dendrobium lituiflorum – Bent-racemed dendrobium
- Dendrobium lobatum
- Dendrobium lobbii
- Dendrobium lobulatum – Small-lobed Dendrobium
- Dendrobium lockhartioides
- Dendrobium loddigesii – Loddiges' Dendrobium
- Dendrobium loesenerianum
- Dendrobium loherianum
- Dendrobium lohohense
- Dendrobium lomatochilum
- Dendrobium lonchigerum
- Dendrobium longicaule
- Dendrobium longicornu – Long-horned dendrobium
- Dendrobium longipecten
- Dendrobium longissimum
- Dendrobium lowii – Low's Dendrobium
- Dendrobium lubbersianum
- Dendrobium lueckelianum – Lueckel's Dendrobium
- Dendrobium lunatum
- Dendrobium luteolum
- Dendrobium luzonense
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