The series "Tortricidae of the Palaearctic Region" will consist of six volumes. Volume one comprises the introduction, examining the tortricid fauna of the Palaearctic in a world context. It contains a brief history of studies on Tortricidae; details on morphology, biology, faunistics, distribution and zoogeography; and a review of characteristics of the non-Palaearctic tribes. A phylogeny and classification is proposed, with a list of all known family-level taxa. Illustrations are provided in support of the text for all chapters, along with colour figures of representatives of each tortricid tribe. The systematic part of volume one is devoted to Tortricini, with a review of the characteristics of the subfamily Tortricinae. For each of the 164 Palaearctic species treated, the following features are provided: synonymy, type locality, critical references, diagnosis, and description, including genitalia and data on early stages, biology, habitats, and food plants. Remarks also are given on distribution and zoogeographic affinity. Adults are illustrated in colour, with multiple images of species that exhibit considerable variation. Line drawings of the male and female genitalia of all known species are provided.