The huge moth family Noctuidae contains the following genera:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Obana Obarza Obdora Obesypena Obrima Obroatis Obtuscampa Obucola Ocalaria Ochrocalama Ochropleura Ochrotrigona Odice Odontelia Odontestra Odontodes Odontoretha Oedebasis Oederastria Oederemia Oediblemma Oedibrya Oedicodia Oediconia Oediplexia Oenoptera Ogdoconta Oglasa Oglasodes Ogoas Ogovia Oidemastis Oligarcha Oligia Oligonyx Olivenebula Olulis Olulodes Olybama Olyssa Ombrea Omia Ommatochila Ommatophora Ommatostola Ommatostolidea Omoptera Omorphina Omphalagria Omphalestra Omphaletis Omphaloceps Omphalophana Omphaloscelis Oncocnemis Oncotibialis Onevatha Onychagrotis Onychestra Oortiana Opacographa Ophideres Ophisma Ophiuche Ophiusa Ophthalmis Ophyx Opigena Oporophylla Opotura Opsigalea Opsyra Optocala Oraesia Orbifrons Orbona Orectis Oria Ornitopia Oroba Orodesma Oromena Oroplexia Orosagrotis Oroscopa Orotermes Orrea Orrhodia Orrhodiella Orsa Ortheaga Orthia Orthoclostera Orthodes Orthogonia Orthogramma Orthogrammica Ortholeuca Orthopha Orthoruza Orthosia Orthozancla Orthozona Ortopla Ortospana Oruza Oruzodes Orygmophora Osericana Oslaria Ossonoba Ostacronycta Ostha Ostheldera Osthelderichola Osthopis Otaces Othreis Othresypna Outaya Ovios Owadaglaea Oxaenanus Oxicesta Oxidercia Oxira Oxogona Oxycilla Oxycnemis Oxygonitis Oxylos Oxyodes Oxythaphora Oxythres Oxytrita Oxytrypia Ozana Ozarba Ozopteryx
References
Natural History Museum Lepidoptera genus database