Proceedings of the 11th Patras Workshop on Axions, WIMPs and WISPs PATRAS2015

The 11th Patras Workshop on Axions, WIMPs and WISPs took place in Zaragoza, on June 22nd to 26th,2015. After the successful 10th-anniversary edition of the conference last year at CERN, this editionbroke again the record with 125 attendants, proof of the good health of the field and the increasing inter-est that axion physics is attracting. The participants enjoyed an intense program of science, comprisingboth theory and experiments, many interesting discussions, but also good gastronomy and sightseeingin Zaragoza. The presentations took place in the Aula Magna of the Paraninfo building of the Universi-dad de Zaragoza, famous for having hosted the lessons of Nobel-prize-winner Santiago Ram ́on y Cajalabout a century ago, as well as one of the few lectures of Albert Einstein in Spain. For the 24th, theconference moved to Canfranc in the Spanish Pyrenees, where the attendants visited the LaboratorioSubterr ́aneo de Canfranc (LSC), a singular facility in Spain, of which the local organizers are associatedresearchers.