Pamukkale Journal of Sport Sciences Vol. XX, No. X; 2020 20 Pamukkale Journal of Sport Sciences 2020 Vol. 11 No. 3, 20-27 ISSN: 1309-0356 accepted: 19.09.2020 Investigation of the Relationship between Attitudes to Moral Decision Making and Moral Disengagement in Youth Student Basketball Players Bahri GÜRPINAR 1 , Osman MUTLU 2 , Merve AYVALLI 3 1 Faculty of Sport Sciences, Akdeniz University, Antalya, Türkiye 2 Faculty of Sport Sciences, Muğla Sıtkı Koçman University, Muğla, Türkiye 3 Faculty of Education, Akdeniz University, Antalya, Türkiye Correspondence: bahrigurpinar@yahoo.com Abstract The aim of this study is to determine the predictive relationships between the attitudes to moral decision-making and the moral disengagement of youth student basketball players doing school sport. Participants were composed of 98 girls (%43,4) and 128 boys (%56,6) totally 223 high school student athletes who compete in the Inter-School Basketball Group Championship. Their average age was 16,16 and their average sport experience was 6,15 years. Both 2 scales used as data collection tool indicated acceptable fit to the data. Correlation analysis showed that moral disengagement was positively associated with cheating (r = 0.47) and gamesmanship (r = 0.47). Regression analyses showed that cheating, gamesmanship and keep winning in proportion (KWIP) variables explain approximately 31% of the total variance of moral disengagement in sports (R=0.554, R^2=0.307, p=0.000). In line with the evidence obtained from the research showed that cheating and gamesmanship attitudes are significant predictors of the moral disengagement but KWIP not. It can be said that student athletes who accept cheating and gamesmanship can use moral disengagement mechanisms more. In addition, there is no evidence that having positive social attitudes reduces moral disengagement in student athletes. Keywords: Moral disengagement, Cheating, Gamesmanship, Keep winning in proportion, Morality in sport, School sport