Positive psychology (PP) is the scientific study of positive emotion and wellbeing. In recent years, there has been a shift in the focus of PP from understanding the factors that contribute to wellbeing to developing and evaluating interventions to improve wellbeing. This article addresses the question of whether the principles and practice of PP are relevant to brain injury rehabilitation. It is concluded that PP is indeed relevant to brain injury rehabilitation; that much of our current (best) practice is consistent with the principles of PP, but there remain areas where brain injury rehabilitation practice could draw further on the specific methods of PP.