Ophrys umbilicata 
Ophrys × lyrata 
Ophrys × sommieri 
Orange Blossom Orchid 
Orange Flame Dendrobium 
Orchid Lockhartia pittieri 
Orchis conica 
Orchis syriaca 
Orchis × sezikiana 
Ornithidium aureum 
Ornithidium nubigenum 
Ornithocephalus dalstroemii 
Otoglossum scansor 
Otoglossum serpens 
Otostylis paludosa 
Pacific coralroot 
Pacific Ground Orchid 
Palawan Coelogyn 
Pale Orchid 
Pale Reed Orchid 
Pale umbrella orchid 
Paphiopedilum callosum 
Paphiopedilum dayanum 
Paphiopedilum delenatii