To examine the factorial validity of the Contesting Orientations Scale (COS) in a large sample of intercollegiate student-athletes, as well as to extend evidence of the COS’ concurrent validity by examining its relationship to autonomous and controlled motivations in sport. The ability of contesting orientations to predict sportspersonship over and above autonomous and controlled motivations was also examined.Cross-sectional and correlational.Five hundred and forty-four intercollegiate US athletes (57.2% male) from individual and team sports completed measures of contesting orientations, autonomous and controlled motivations, and sportspersonship.Confirmatory factor analysis (CFA) supported the factorial validity of the COS, while correlational results supported its concurrent construct validity, with autonomous motivation associated with higher levels of partnership orientation and controlled motivation associated with higher levels of war orientation. In addition, sequential regression analyses supported the predictive utility of contesting orientations, with partnership orientation emerging as a significant positive predictor of four – and war orientation a negative predictor of three – dimensions of sportspersonship. Mediation analyses suggested that contesting orientations may partially mediate the relationship between autonomous and controlled motivations for some dimensions of sportspersonship.The COS is a valid and reliable measure of contesting orientations. Partnership and war contesting orientations, moreover, add significantly to the prediction of sportspersonship over and above autonomous and controlled motivations. In practice, if the goal is to promote good sportspersonship, coaches and other adults involved in competitive sport should emphasize a partnership contesting orientation in addition to more autonomous forms of motivation.