Species composition of Hydrophilidae and Helophoridae (Coleoptera) gathered from Izmir, Manisa and Aydm provinces located in the Aegean Region of Turkey were determined in this study. Field surveys were conducted between May - November 2013 and February-November 2014. Totally, 30 species belonging to 8 genera were recorded from the study areas; 21 from Hydrophilidae and 9 from Helophoridae. Among them 15 are (50% of whole collected taxa) firstly reported from the Aegean Region of Turkey. All species were presented with updated Turkey distributions.