This article provides a checklist of onion pest insects. There are 8 order, 28 families, and 62 species belonging to 48 genera. The species belonging to the Noctuidae family (11 genera and 14 species) were recorded the most common and following families also are recorded Chrysomelidae, Curculionidae, Anobiidae,Ephydridae, Aleyrodidae, Pentatomidae, Pieridae and Gryllotalpidae. The article also contains information about the vegetative and generative organs of the onion plant and the harmful stage of the insect.