Obtuse Euchlaena 
Obtuse Yellow 
Ocaria calesia 
Ocean Spray Fairy Moth 
Ochlodes hyrcana 
Ochlodes venata 
Ochre dagger moth 
Ochre-winged hag moth 
Ochus subvittatus 
Ocinara albicollis 
Ocola skipper 
Octagonal Casemaker Moth 
Octauius swordtail 
Odonestis erectilinea 
Odontodes pallidifimbria 
Oenochlora imperialis 
Oenochroma hieroglyphica 
Oenoe hybromella 
Oenoptila purpurea 
Oenoptila recessa 
Oeonistis altica 
Oeonistis bicolora 
Ogmograptis scribula 
Oiketicus kirbyi