In this study, the fauna of Papilionoidea and Hesperioidea (Lepidoptera) in Aegean region (Southwest Turkey) has been investigated. Information regarding field studies which were carried out during years 2003 and 2004 was given. The specimens of the order Lepidoptera have been collected from 35 different localities. It has been determined that these specimens are belonging to 87 species distributed in 7 families. The distribution of species (according to families) were given as: Papilionidae (3); Pieridae (12); Libytheidae (1); Argynnidae (11); Satyridae (18); Lycaenidae (25) and Hesperiidae (8).