It is our pleasure to invite you to the 12th International Symposium on Parallel and Distributed Computing (ISPDC 2013). Following very successful prior editions since 2002 at various locations throughout Europe, including last time in June 2012 in Munich, Germany, our next ISPDC edition will be held from June 27th through 30th, 2013, in Bucharest, Romania, and will be organized by the Computer Science Department, Faculty of Automatic Control and Computers, University Politehnica of Bucharest. The mission of the 12th International Symposium on Parallel and Distributed Computing is to bring together researchers, engineers, and practitioners involved in the development of new algorithms and architectures for parallel and distributed computing, as well as visualisation and postprocessing. The goal is to provide an interactive and friendly yet professional forum for original research contributions describing novel ideas, groundbreaking results or quantified system experiences. We cordially invite you to submit your contribution to the 12th International Symposium on Parallel and Distributed Computing (ISPDC 2013).