To investigate the relationship between perceived motivational climate and moral functioning, moral atmosphere, and legitimizing injurious sports acts among competitive youth football players.A perceived performance climate will be associated with lower moral functioning, less appropriate moral atmosphere perceptions, and a greater likelihood of legitimizing aggression in competitive football than a perceived mastery climate. A perceived performance climate will be associated with lower moral cognitions and behavior. Lastly, boys will be lower in sport morality than girls.A cross-sectional study of 705 competitive Norwegian youth football players (n=365 boys; n=340 girls). Participants responded to a questionnaire measuring coach-created motivational climate, moral functioning, moral atmosphere, and the legitimacy of injurious acts in football.Hierarchical multiple regression analyses were conducted to investigate the differential effect of mastery and performance climate perceptions on the moral variables. Controlling for the emergence of gender differences, climate interactions emerged for moral judgment and intentional aggression by means of physical intimidation. A high performance/high mastery climate significantly predicted lower moral judgment as well as the legitimacy of using physical intimidation. Further, climate main effects indicated that perceiving a performance climate significantly predicted overall low sport morality, whereas mastery climate perception predicted more mature moral reasoning and a coach-determined moral atmosphere disproving of low moral behavior.Our findings further emphasize the low moral effect of a high perceived coach-created performance climate in competitive youth football.