This document provides information about the 66th International Astronautical Congress (IAC) that will take place from October 12-16, 2015 in Jerusalem, Israel. It includes welcome messages from the President of the International Astronautical Federation, the Local Organizing Committee, and the International Programme Committee Co-Chairs. It also provides details about the organizers of the IAC including the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Additionally, it includes practical information for attendees such as a map of Jerusalem, information about airports and transportation, registration details, the conference venue floor plans, and schedules. Finally, it outlines the conference program, technical program sessions, student and young professional events