A Study on insects was carried out on Pererenan, District of Mengwi, Badung Regency, Baliprovince, between September and December, 2006. Samples were captured using insect nets. Thesamples were then identified for determination of their species. Their roles on the ecosystem weredescribed. Seven species of butterflies and 29 kinds of other insects were identified on this study.From those, none to be classified as protected species.