- Dendrobium cabadharense
- Dendrobium cacatua (formerly D. tetragonum var. hayesianum)
- Dendrobium cadetiiflorum
- Dendrobium cadetioides
- Dendrobium calcaratum
- Dendrobium calcariferum
- Dendrobium calceolum
- Dendrobium calicopis
- Dendrobium callitrophilum
- Dendrobium calophyllum
- Dendrobium calothyrsos
- Dendrobium calyculimentum
- Dendrobium calyptratum
- Dendrobium camaridiorum
- Dendrobium campbellii
- Dendrobium canaliculatum – Groove-leaved Dendrobium, Onion Orchid, Yellow Tea-tree Orchid
- Dendrobium canaliculatum var. canaliculatum
- Dendrobium canaliculatum var. nigrescens
- Dendrobium cancroides
- Dendrobium candidum
- Dendrobium capillipes – Hairy-column-footed Dendrobium
- Dendrobium capitellatoides
- Dendrobium capitellatum
- Dendrobium capitisyork (formerly D. tetragonum var. giganteum)
- Dendrobium capituliflorum – Small Flower-head Dendrobium, White Bottle-brush Orchid
- Dendrobium capra
- Dendrobium cariniferum – Keel-carrying Dendrobium
- Dendrobium carnicarinum
- Dendrobium carolinense
- Dendrobium carrii – Carr's Dendrobium
- Dendrobium carronii – Carron's Dendrobium, Pink Tea-tree Orchid
- Dendrobium carstensziense
- Dendrobium caryicola
- Dendrobium casuarinae
- Dendrobium cathcartii
- Dendrobium catillare
- Dendrobium caudiculatum
- Dendrobium cavipes
- Dendrobium cemensiae
- Dendrobium ceraceum
- Dendrobium ceraula
- Dendrobium chalmersii
- Dendrobium chameleon – Chameleon Dendrobium
- Dendrobium changjiangense
- Dendrobium chittimae
- Dendrobium chlorostylum
- Dendrobium chordiforme
- Dendrobium christyanum – Christy's Dendrobium
- Dendrobium chrysanthum – Golden yellow-flowered dendrobium
- Dendrobium chryseum – Yellow-flowered Dendrobium
- Dendrobium chrysobulbon
- Dendrobium chrysocrepis
- Dendrobium chrysopterum
- Dendrobium chrysosema
- Dendrobium chrysotainium
- Dendrobium chrysotoxum – Golden-bow dendrobium, Fried-egg orchid
- Dendrobium ciliatilabellum
- Dendrobium cinereum – Light-grey Dendrobium
- Dendrobium cinnabarinum
- Dendrobium cinnabarinum var. angustitepalum
- Dendrobium cinnabarinum var. cinnabarinum
- Dendrobium clausum
- Dendrobium clavator – Club-shaped Dendrobium
- Dendrobium clavuligerum
- Dendrobium cleistogamum
- Dendrobium closterium
- Dendrobium closterium var. closterium
- Dendrobium closterium var. jocosum
- Dendrobium cochleatum
- Dendrobium cochliodes – Shell-like Dendrobium
- Dendrobium codonosepalum
- Dendrobium coelandria
- Dendrobium coeloglossum – Coelogyne-lipped Dendrobium
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- Dendrobium collinum
- Dendrobium coloratum
- Dendrobium compactum
- Dendrobium compressicaule
- Dendrobium compressimentum
- Dendrobium compressistylum
- Dendrobium compressum
- Dendrobium comptonii (formerly D. gracilicaule var. howeanum)
- Dendrobium conanthum
- Dendrobium concavum
- Dendrobium concinnum – Elegant Dendrobium
- Dendrobium confinale
- Dendrobium confundens
- Dendrobium confusum
- Dendrobium conicum
- Dendrobium connatum
- Dendrobium consanguineum
- Dendrobium constrictum
- Dendrobium convexipes
- Dendrobium convolutum – Convoluted Dendrobium
- Dendrobium copelandianum
- Dendrobium corallorhizon
- Dendrobium correllianum
- Dendrobium corrugatilobum
- Dendrobium corticicola
- Dendrobium courtauldii
- Dendrobium crabro
- Dendrobium crassicaule
- Dendrobium crassiflorum
- Dendrobium crassifolium – Thick-leaved Dendrobium
- Dendrobium crassilabium : Papua New Guinea
- Dendrobium crassimarginatum
- Dendrobium crassinervium
- Dendrobium crenatifolium
- Dendrobium crenatilabre
- Dendrobium crepidatum – Shoe-lipped dendrobium
- Dendrobium cretaceum
- Dendrobium crispatum
- Dendrobium crispilinguum
- Dendrobium crispulum
- Dendrobium crocatum – Saffron-yellow Dendrobium
- Dendrobium croceocentrum
- Dendrobium crucilabre
- Dendrobium cruentum – Blood-red Dendrobium
- Dendrobium crumenatum – Pigeon Orchid, Sparrow Orchid, Bag-shaped Dendrobium, "dove orchid"
- Dendrobium cruttwellii – Cruttwell's Dendrobium
- Dendrobium crystallinum – Shiny crystal dendrobium
- Dendrobium cuculliferum
- Dendrobium cucullitepalum
- Dendrobium cultratum
- Dendrobium cultrifolium
- Dendrobium cumelinum
- Dendrobium cumulatum – Crowded-bulb Dendrobium
- Dendrobium cuneatipetalum
- Dendrobium cuneatum
- Dendrobium cuneiforme
- Dendrobium cuneilabrum
- Dendrobium curvicaule (formerly D. speciosum var. capricornicum, D. speciosum var. curvicaule)
- Dendrobium curviflorum
- Dendrobium curvimentum
- Dendrobium curvisepalum
- Dendrobium curvum
- Dendrobium cuspidatum
- Dendrobium cuthbertsonii – Cuthbertson's Dendrobium
- Dendrobium cyanocentrum – Black-blue-spurred Dendrobium
- Dendrobium cyanopterum
- Dendrobium cyatopoides
- Dendrobium cyclolobum
- Dendrobium cylindricum
- Dendrobium cymatoleguum
- Dendrobium cymbiforme
- Dendrobium cymboglossum – Boat-lipped Dendrobium
- Dendrobium cymbulipes
- Dendrobium cyrtolobum
- Dendrobium cyrtosepalum
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