The 8th Barbados Workshop on Reinforcement Learning will take place during the week of April 27-May 3 at McGill's Bellairs Institute in Holetown, Barbados. The workshop seeks to bring together some of the best and latest thinking on a specific theme in reinforcement learning research. A special feature of the workshop is its multi-disciplinary emphasis; we try each year to bring in new people from some of the many related disciplines, such as psychology, control theory, operations research, and neuroscience.