It is within this context that the eighth annual Conference on Nanostructured Thin Films took place in San Diego on the 12th and 13th of August 2015 as part of the annual SPIE Optics + Photonics symposium. For the past eight years, this conference has provided a forum for the nanostructured-thin-films community to present and discuss its latest research findings. As in previous conferences, the 2015 conference featured a diverse mix of presentations pertaining to the design, fabrication, and characterization of nanostructured thin films, delivered by both well-established and up-and-coming researchers, representing all parts of the world. In total, 39 presentations were delivered, spread over 10 oral sessions and one poster session, on topics such as control and modification, applications and devices, theoretical studies, and fabrication. The conference began with a keynote lecture on optical coatings and metamaterials.