The purpose of the present review was to provide an up-to-date summary of the burnout-in-sport literature. The last published reviews were in 1989 (Fender) and 1990 (Dale & Weinberg). In order to appreciate the status of current knowledge and understanding and to identify potential future directions, the authors conducted a synthesis of published work using a systematic-review methodology. Findings comprised 3 sections: sample characteristics, correlates, and research designs and data collection. A total of 58 published studies were assessed, most of which focused on athletes (n = 27) and coaches (n = 23). Correlates were grouped into psychological, demographic, and situational factors and were summarized as positively, negatively, indeterminate, and nonassociated with burnout. Self-report measures and cross-sectional designs have dominated research. The authors conclude by summarizing the key findings in the literature and highlighting the gaps that could be filled by future research.