- Dendrobium aberrans – Deviating Dendrobium
- Dendrobium acaciifolium
- Dendrobium acanthophippiiflorum
- Dendrobium acerosum
- Dendrobium acianthum
- Dendrobium aciculare
- Dendrobium acinaciforme – Saber-shaped Dendrobium
- Dendrobium aclinia
- Dendrobium acuminatissimum
- Dendrobium acutifolium
- Dendrobium acutilobum
- Dendrobium acutimentum
- Dendrobium acutisepalum
- Dendrobium adae – Ada's Dendrobium
- Dendrobium adamsii
- Dendrobium aduncum – Inward-bent dendrobium, Angelfish orchid
- Dendrobium aemulum – Ironbark Orchid, Brush Box Orchid, White-feather Orchid, Similar-looking Dendrobium
- Dendrobium aemulum var. aemulum
- Dendrobium aemulum var. callitrophilum
- Dendrobium affine
- Dendrobium agathodaemonis
- Dendrobium agrostophylloides
- Dendrobium agrostophyllum – Grassy-leaved Dendrobium
- Dendrobium agusanense
- Dendrobium alabense
- Dendrobium alaticaulinum – Winged-stem Dendrobium
- Dendrobium albayense
- Dendrobium albosanguineum – White and blood-red dendrobium
- Dendrobium alboviride
- Dendrobium alderwereltianum
- Dendrobium alexandrae – Alexandra's Dendrobium
- Dendrobium aliciae
- Dendrobium aloefolium
- Dendrobium alterum
- Dendrobium alticola
- Dendrobium amabile
- Dendrobium amboinense
- Dendrobium ambotiense
- Dendrobium amethystoglossum – Amethyst-coloured Dendrobium
- Dendrobium amoenum – Lovely Dendrobium
- Dendrobium amphigenyum
- Dendrobium anamalayanum
- Dendrobium anceps – Double-edged Dendrobium
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- Dendrobium × andersonianum
- Dendrobium andreemillarae
- Dendrobium angiense
- Dendrobium angulatum
- Dendrobium angustiflorum
- Dendrobium angustipetalum
- Dendrobium angustispathum
- Dendrobium annae
- Dendrobium annamense
- Dendrobium annuligerum
- Dendrobium anosmum – Unscented dendrobium
- Dendrobium anosmum var. Dearei or Alba
- Dendrobium anosmum var. Huttonii
- Dendrobium anosmum var. Semi-alba
- Dendrobium anosmum var. Superbum
- Dendrobium antennatum – Antelope orchid (sometimes separated in Ceratobium)
- Dendrobium anthrene
- Dendrobium apertum
- Dendrobium aphanochilum
- Dendrobium aphrodite – Aphrodite's Dendrobium
- Dendrobium aphyllum – Leafless dendrobium
- Dendrobium appendicula
- Dendrobium aqueum
- Dendrobium araneum
- Dendrobium argiense
- Dendrobium aridum
- Dendrobium aries
- Dendrobium aristiferum
- Dendrobium armeniacum
- Dendrobium armitiae
- Dendrobium aromaticum
- Dendrobium arthrobulbum
- Dendrobium asperatum
- Dendrobium asperifolium
- Dendrobium asphale
- Dendrobium assamicum
- Dendrobium atavus
- Dendrobium atjehense
- Dendrobium atromarginatum
- Dendrobium atropurpureum
- Dendrobium atrorubens
- Dendrobium atroviolaceum – Black blood-red dendrobium
- Dendrobium attenuatum
- Dendrobium aurantiflammeum
- Dendrobium aurantiroseum – Aunty Rosie
- Dendrobium auriculatum – Eared Dendrobium
- Dendrobium austrocaledonicum
- Dendrobium auyongii
- Dendrobium axillare
- Dendrobium ayubii
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