On behalf of the Organizing Committee it is our pleasure to cordially invite you to attend the 13th International Conference on Calixarenes "Calix 2015" that will be held in Giardini Naxos (Italy) from Sunday 5 to Thursday 9 July 2015. The conference aims to provide a comprehensive survey of both fundamental and applied research in the field of calixarenes and related macrocyclic compounds. In keeping with its 22-year-long history and its own friendly and casual tradition, this five-day event intends to bring together scientists, industry professionals, academics and students from all over the world to present their current research and discuss and shape the future challenges of the field. The conference will feature the 1st C. David Gutsche Award lecture, an opening and a closing plenary lecture, as well as keynote and invited lectures delivered by top-tier international scientists active in the field. The program will also include a number of flash communications that will be selected from among the contributions submitted for the poster session.