This volume contains the proceedings of the 1st International Workshop on Strategic Reasoning 2013 (SR 2013), held in Rome (Italy), March 1617, 2013. The SR workshop aims to bring together researchers, possibly with different backgrounds, working on various aspects of strategic reasoning in computer science, both from a theoretical and a practical point of view. This year SR has hosted four outstanding invited talks by Krishnendu Chatterjee, Alessio R. Lomuscio, Jean-Francois Raskin, and Michael Wooldridge. Moreover, the program committee selected 13 papers among the 23 contributions submitted. Almost all of them have been revised by three reviews and the contributions have been selected according to quality and relevance to the topics of the workshop.