The fifth international workshop on Quality of Multimedia Experience (QoMEX) will bring together leading professionals and scientists interested in evaluating multimedia quality and user experience. QoMEX is the flagship workshop of the European COST action Qualinet, which serves as its technical and financial sponsor. After San Diego (2009), Trondheim (2010), Mechelen (2011), and Yarra Valley (2012), QoMEX 2013 will be held in Klagenfurt am Wörthersee, Austria. Multimedia is a ubiquitous part of modern life; content is delivered to a wide variety of devices both fixed and mobile, the consumption environment can vary dramatically, and users increasingly demand fulfilling interaction with their media. Evaluation, both objective and subjective, of separate audio, video, or image content is well established, but there are substantial challenges in assessing users’ experiences of mixed content. This is exacerbated by the diversity of devices, interfaces, consumption environments, and content prevalent in today’s market. Increasingly, evaluation approaches must include psychological, perceptual, and contextual dimensions to truly represent and measure the users’ experiences. Understanding and modelling how users react to and perceive content and applications will inform and improve new applications and lead to better user experiences.