The aim of this study was to investigate the reason of sport injuries and their causes among adolescent basketball players according to their playing position. 26 (31,7 %) guards, 32 (39%) forwards and 24 (29,3%) centers, totally 82 (100%) adolescent basketball players participated in the study as a volunteer. They were between 13-19 ages and they answered sport injury questionnaire which was designed by researcher. As a result ; during their sport life 58 (%70,7) of the 82 (100%) players had injuries and 24 (29,3%) players did not. Most widely effected side was foot (72,4%) and most injury type was sprain (67,2%). Generally injury accour at the competion (62,1%) by the opposite team player (55,6%). Besides majority of players can return in to copmtetions less than a week (63,8%). According to playing positions, forwards were more injured players (43,2%) than guards and centers