The distribition, host plants, type of damage and biology of Tortricidde species \vhich are living in Marmara Region are investigated by this study. The know!edge about the species living in this region \vere gathered from the available literatüre. After that, several surveys were made to several locations collecting materials on different dates. The collected and laboratory breeding insects were identified under the supervision of the specialists. Also, the morfology, distribistion, host plants, biology and damage of these insects \vere studied. As a result of this study, 40 species of this familly which are living in this region were distinguished. The populations of some species were above the tolarance Ievel.