- Dendrobium maccarthiae – Wesak Orchid, vesak mala (Ceylon)
- Dendrobium macfarlanei
- Dendrobium macranthum
- Dendrobium macraporum
- Dendrobium macrifolium
- Dendrobium macrogenion
- Dendrobium macrophyllum – Large-leaved dendrobium, Pastor's orchid (formerly D. musciferum)
- Dendrobium macrophyllum var. macrophyllum
- Dendrobium macrophyllum var. subvelutinum
- Dendrobium macropus (formerly D. gracilicaule var. macropus)
- Dendrobium macrostachyum
- Dendrobium macrostigma
- Dendrobium maculosum
- Dendrobium magistratus
- Dendrobium maierae
- Dendrobium malacanthum
- Dendrobium malbrownii
- Dendrobium maleolens
- Dendrobium malvicolor – Mallow-colored Dendrobium
- Dendrobium mannii
- Dendrobium maraiparense
- Dendrobium margaretiae
- Dendrobium marivelense
- Dendrobium marmoratum
- Dendrobium masarangense
- Dendrobium masarangense ssp. masarangense
- Dendrobium masarangense var. chlorinum
- Dendrobium mastersianum
- Dendrobium mayandyi
- Dendrobium megaceras
- Dendrobium melaleucaphilum (formerly D. tetragonum var. melaleucaphilum)
- Dendrobium melanostictum
- Dendrobium melanotrichum
- Dendrobium melinanthum – Millet-pollinia Dendrobium
- Dendrobium meliodorum
- Dendrobium mellicolor
- Dendrobium merrillii
- Dendrobium metachilinum
- Dendrobium metrium
- Dendrobium micholitzii
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- Dendrobium microbulbon
- Dendrobium microglaphys
- Dendrobium milaniae – Po-Milan's Dendrobium
- Dendrobium militare
- Dendrobium millarae
- Dendrobium mindanaense
- Dendrobium minimiflorum
- Dendrobium minimum
- Dendrobium minutiflorum
- Dendrobium minutigibbum
- Dendrobium mirandum
- Dendrobium mirbelianum – Mirbel's Dendrobium, Mangrove Orchid
- Dendrobium mischobulbum
- Dendrobium miserum
- Dendrobium miyasakii – Miyasaki's Dendrobium
- Dendrobium modestissimum
- Dendrobium modestum
- Dendrobium mohlianum – Mohl's Dendrobium
- Dendrobium molle
- Dendrobium moluccense
- Dendrobium moniliforme – Sekikoku
- Dendrobium monophyllum – Lily-of-the-Valley Orchid
- Dendrobium montanum – Mountain Dendrobium
- Dendrobium montedeakinense
- Dendrobium monticola
- Dendrobium montis-sellae
- Dendrobium montis-yulei
- Dendrobium mooreanum
- Dendrobium moorei – Moore's Dendrobium
- Dendrobium moquetteanum
- Dendrobium morotaiense
- Dendrobium mortii – Pencil Orchid, "rattail orchid"
- Dendrobium moschatum – Musky-smelling dendrobium
- Dendrobium mucronatum
- Dendrobium multifolium
- Dendrobium multilineatum
- Dendrobium multiramosum
- Dendrobium multistriatum
- Dendrobium munificum
- Dendrobium muricatum
- Dendrobium mussauense
- Dendrobium mutabile – Variable dendrobium
- Dendrobium mystroglossum
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