It is our sincere pleasure to announce our first international conference PDFA, Polymers: Design, Function and Application, organized by the MDPI open-access journal Polymers. The inaugural conference will be held as a two-day event in Barcelona, Spain, March 21-23, 2018.We cordially invite researchers from both academia as well as industry, to join this polymer conference and to present cutting-edge research at the interface of design/function or function/application of polymers as a lecture or a poster. With its focus on function- and application-driven polymer research.