The 22 papers published in this special issue arise from a call for submissions from the participants at the 11(th) World Congress on Neurohypophysial Hormones (WCNH) in 2015. As the Chair of the Local Organising Committee (Colin Brown) and Senior Editor for this issue (Oliver Bosch), we extend our thanks to the contributors for their excellent reviews and original research articles, as well as to the many colleagues and friends who gave generously of their time to complete reviews of the submitted articles. We also thank the Editorial Board of The Journal of Neuroendocrinology for their enthusiastic support of the special issue and of the WCNH itself, along with the other meeting sponsors: the University of Otago, the University of Waikato, the Otago Centre for Neuroendocrinology, the British Society for Neuroendocrinology and the Maurice and Phyllis Paykel Trust; without their generous financial support, the meeting would not have been possible. Of course, it was the hard work of the members of the Local Organising Committee and International Advisory Committee that saw the meeting through to such great success. This article is protected by copyright. All rights reserved.