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
Iambia Iambiodes Ianius Ichneutica Ichthyopselapha Idalima Idia Idicara Ikondiana Ilarus Ilattia Ilsea Iluza Ilyrgis Ilyrgodes Imitator Imleanga Immetalia Imosca Inabaia Incita Indocala Ingura Inguridia Insolentipalpus Interdelta Internoctua Iodopepla Iontha Ipanephis Ipanica Ipermarca Ipimorpha Ipiristis Ipnea Ipnista Iranada Isadelphina Isana Isatoolna Ischyja Isochlora Isogona Isolasia Isopolia Isoura Istarba Itmaharela Itomia
References
Natural History Museum Lepidoptera genus database