Cone-Flower Dendrobium 
Cooktown Orchid 
Corybas aconitiflorus 
Cowl-carrying Maxillaria 
Cowslip Orchid 
Cranefly Orchid 
Creeping Lady's-tresses 
Cretan Orchis 
Crimson cattleya 
Crossoglossa sotoana 
Crowded Maxillaria 
Cryptocentrum latifolium 
Curled Lepanthes 
Curled Pleurothallis 
Cyclopogon comosus 
Cymbidiella flabellata 
Cymbidium bicolor pubescens 
Cymbidium finlaysonianum 
Cymbidium lowianum 
Cymboglossum cymbidiifolium 
Cynorkis fastigiata 
Cypress-knee helmet orchid 
Cypripedium calceolus 
Cypripedium tibeticum