The 10th European Workshop on Reinforcement Learning (EWRL), held June 30–July 1, 2012 in Edinburgh, Scotland, served as a forum to discuss the current state-of-the-art and future research directions in the continuously growing field of reinforcement learning (RL). We made EWRL an exciting and well-received event for the international RL community. Therefore, we appreciate that we could attract a wide spectrum of researchers by co-locating EWRL 2012 with the International Conference on Machine Learning.
We were very excited about our outstanding invited speakers Martin Riedmiller (University of Freiburg),  Drew Bagnell (Carnegie Mellon University), Shie Mannor (Technion), and Richard Sutton (University of Alberta), who gave great overviews of current research and
diverse application areas of reinforcement learning. EWRL 2012 had 63 submissions from which 43 (68%) were accepted for presentation at the workshop. These post-proceedings contain 12 (19%) selected revised papers submitted to EWRL 2012.