The 12th International Working Conference on Advanced Visual Interfaces (AVI 2014) will be held in Como (Italy) at the campus of Politecnico di Milano, from May 27th to 30th, 2014. Started in 1992 in Rome, AVI has become a biannual appointment for a wide International community of experts with a broad range of backgrounds, who share the interest in the investigation, design, development, and evaluation of innovative interactive solutions impacting our world at individual and societal level. Through more than two decades, the Conference has contributed to the progress of Human-Computer Interaction, offering a forum to present and disseminate new technological results, new paradigms and new visions for interaction and interfaces. AVI 2014 offers a wide variety of submission types to suit many types of interests and works. They include full and short research papers, demos, industry papers, and workshops. Theoretical and formal approaches, novel methodologies, domain-specific applications, empirical studies, new technological solutions, and industrial achievements fit well into the framework of the conference. The program also includes a number of prestigious invited talks as well social events at magnificent villas on the Como lake.