Rust-red ascocentrum 
Saint Vincent Epidendrum 
Salmon sun orchid 
Sander's Maxillaria 
Sarcoglottis acaulis 
Sarcoglottis sceptrodes 
Satyr Lepanthes 
Satyrium nepalense 
Sawfly Orchid 
Scaphosepalum beluosum 
Scaphosepalum dodsonii 
Scaphosepalum grande 
Scaphosepalum odontochilum 
Scaphosepalum swertiifolium 
Scaphyglottis behrii 
Scaphyglottis punctulata 
Scarlet greenhood 
Schoenorchis buddleiflora 
Serapias cordigera 
Serapias levantina 
Serapias orientalis 
Serapias strictiflora 
Sertifera purpurea 
Shining Ladies' Tresses