- Dendrobium sacculiferum
- Dendrobium sagittatum
- Dendrobium salaccense
- Dendrobium salebrosum
- Dendrobium salicifolium
- Dendrobium salomonense
- Dendrobium sambasanum
- Dendrobium samoense
- Dendrobium sancristobalense
- Dendrobium sanderae – Mrs. Sander's Dendrobium
- Dendrobium sanderae var. Luzonense
- Dendrobium sanderae var. Major
- Dendrobium sanderae var. Parviflorum
- Dendrobium sanderae var. Surigaoense
- Dendrobium sanderianum
- Dendrobium sandsii
- Dendrobium sanguinolentum – Blood-stained dendrobium
- Dendrobium sarawakense
- Dendrobium sarcochilus
- Dendrobium sarcochilus var. megalorhizum
- Dendrobium sarcochilus var. sarcochilus
- Dendrobium sarcodes
- Dendrobium sarcodes var. majus
- Dendrobium sarcodes var. sarcodes
- Dendrobium sarcophyllum
- Dendrobium sarmentosum
- Dendrobium scabrifolium
- Dendrobium scabrilingue – Rough-lipped Dendrobium
- Dendrobium schneiderae – Mrs. Schneider's Dendrobium
- Dendrobium schneiderae var. major
- Dendrobium schneiderae var. schneiderae
- Dendrobium schoeninum
- Dendrobium schuetzei – Schütze's Dendrobium
- Dendrobium schulleri
- Dendrobium schwartzkopfianum
- Dendrobium schweinfurthianum
- Dendrobium scirpoides
- Dendrobium scopula
- Dendrobium scoriarum
- Dendrobium sculptum
- Dendrobium secundum – Toothbrush orchid
- Dendrobium secundum var. Alba
- Dendrobium senile – White-haired dendrobium, Old Man Orchid
- Dendrobium septemcostulatum
- Dendrobium seranicum
- Dendrobium serratilabium – Toothed-lip Dendrobium
- Dendrobium serratipetalum
- Dendrobium setifolium
- Dendrobium setigerum – Synonym of Dendrobium macrophyllum
- Dendrobium setosum
- Dendrobium shiraishii
- Dendrobium shompenii
- Dendrobium siberutense
- Dendrobium sidikalangense
- Dendrobium signatum
- Dendrobium simondii
- Dendrobium sinense
- Dendrobium singaporense
- Dendrobium singkawangense – Singkawang Dendrobium
- Dendrobium singulare
- Dendrobium sinuatum
- Dendrobium sinuosum
- Dendrobium sladei
- Dendrobium smillieae – Smillie's Dendrobium, Bottlebrush Orchid
- Dendrobium smithianum
- Dendrobium sociale
- Dendrobium somai
- Dendrobium soriense
- Dendrobium sororium
- Dendrobium spatella
- Dendrobium spathilabium
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- Dendrobium spathilingue
- Dendrobium spathipetalum
- Dendrobium spathulatum
- Dendrobium speciosum – Outstanding Dendrobium, King Orchid, Rock Lily
- Dendrobium speckmaieri
- Dendrobium spectabile – Grand Dendrobium
- Dendrobium spectatissimum
- Dendrobium speculigerum
- Dendrobium sphegidoglossum – Wasp-lipped Dendrobium
- Dendrobium sphenochilum
- Dendrobium spurium
- Dendrobium steatoglossum
- Dendrobium steinii
- Dendrobium stelidiiferum
- Dendrobium stenophyllum
- Dendrobium stictanthum
- Dendrobium stockeri
- Dendrobium stolleanum
- Dendrobium stratiotes – Stalwart Dendrobium
- Dendrobium straussianum
- Dendrobium strebloceras – Twisted-horned dendrobium
- Dendrobium strepsiceros
- Dendrobium striaenopsis : was, Dendrobium bigibum var. schroederianum
- Dendrobium striatellum
- Dendrobium striatiflorum
- Dendrobium striolatum – Streaked Rock Orchid, "rattail orchid"
- Dendrobium strongylanthum
- Dendrobium stuartii
- Dendrobium stuposum – Flax-like Dendrobium
- Dendrobium suaveolens
- Dendrobium subacaule
- Dendrobium subbilobatum
- Dendrobium subclausum
- Dendrobium subclausum var. pandanicola
- Dendrobium subclausum var. phlox
- Dendrobium subclausum var. speciosum
- Dendrobium subclausum var. subclausum – Almost-closed-flowered Dendrobium
- Dendrobium subelobatum
- Dendrobium subflavidum
- Dendrobium subpandifolium
- Dendrobium subpetiolatum
- Dendrobium subquadratum
- Dendrobium subserratum
- Dendrobium subsessile
- Dendrobium subtricostatum
- Dendrobium subulatoides
- Dendrobium subulatum
- Dendrobium subuliferum
- Dendrobium × suffusum
- Dendrobium sulcatum – Furrowed-lip dendrobium
- Dendrobium sulphureum
- Dendrobium sulphureum var. cellulosum
- Dendrobium sulphureum var. rigidifolium
- Dendrobium sulphureum var. sulphureum
- Dendrobium sumatranum
- Dendrobium summerhayesianum
- Dendrobium superans
- Dendrobium × superbiens
- Dendrobium superbum – Honohono Synonym of Dendrobium anosmum
- Dendrobium sutepense
- Dendrobium sutiknoi
- Dendrobium suzukii – Suzuki's Dendrobium
- Dendrobium swartzii
- Dendrobium sylvanum – Forest-dwelling Dendrobium
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