Stelis convallaria 
Stelis eublepharis 
Stelis restrepioides 
Stelis sclerophylla 
Stelis superbiens 
Stenoptera peruviana 
Striking Masdevallia 
Striped coralroot 
Sugar orchid 
Sun orchid 
Swamp sun orchid 
Sword-leaf Oberonia 
Sword-Shaped Leaf Elleanthus 
Sydney Rock Orchid 
Tachira Lepanthes 
Taeniophyllum hirtum 
Tall leek orchid 
Tall shield orchid 
Tartan tongue orchid 
Telipogon andicola 
Telipogon boissierianus 
Telipogon glicensteinii 
Telipogon jucusbambae 
Telipogon lehmannii