Certain aphids (Aphidoidea), commonly known as greenfly in Britain and the Commonwealth
Lucilia sericata, common green bottle fly
especially, Myzus persicae, green peach aphid
Odontomyia chloris (syn. Musca chloris)
Tabanus nigrovittatus, a biting horsefly more commonly known as the greenhead horsefly, greenhead fly, or greenhead
Any of several kinds of common insects green in color