This study examined the relation between sports involvement and delinquency of youth, showed the role and benefits of participation in sports and provided data for establishing sports activity programs to lessen delinquency. Sports involvement was classified into behavioral, affective and cognitive involvement and delinquency into public order, property, position, relationship and seclusion to examine the level of Participation in Sports and delinquency according to demographical variables and to what extent Participation in Sports may influence in deterring delinquency. Research was conducted on 602 urban and rural middle school and high school students, and questionnaire survey from papers (Koo, Changmo(1991), Kwon, Soonyong(1992), Ryu Inwon(2003), Oh, Yonghwan(1998), Lee,Yongsoon(2002)) were referred to and modified for the purpose of this study. Collected data was computerized through SPSS program by One-way Anova and Multiple Regression Analysis to draw the following results. First, from the demographical aspect of sports involvement definitional aspect showed the highest involvement followed by cognitive and active aspects. In detail, boys than girls, junior-high than high schools, and urban than rural residents demonstrated greater participation in sports. Upper class students had higher level of involvement than in middle or low class, and students with parents who supported sports participation were more likely to be involved in sports than those without. Most number of students participated in sports whose parents had administrative occupation and least of those with specialized professions. Second, from the demographical aspect delinquency of position showed the highest level followed by that of public order, relationship, seclusion, and property. Boys showed higher level of delinquency especially in public order and position level. Compared to junior-high students high school students showed higher level of delinquency in all aspects, and rural residents appeared to be more delinquent than urban residents. The lower the living standard gets, the more it was likely for the students to be delinquent. Students with parents who opposed to sports involvement showed higher level of delinquency than students with those who agreed, and greatest level of delinquency showed on the students whose parents were unemployed and lowest level on the students whose parents had administrative occupation. Third, affective involvement aspect of participation in sports with mostly favorable effects had greatest influences on delinquency level bringing self-esteem for the youth, then followed the behavioral involvement and cognitive involvement. In detail, delinquencies of public order, position, property and seclusion were influenced mostly by affective involvement followed by the behavioral involvement and least by cognitive involvement. Whereas delinquency of relationship was mostly influenced by affective involvement followed by cognitive involvement and least by behavioral involvement. Collective results show that demographical aspects and participation in sports have influences on the delinquency level and that participation in sports plays an important role in deterring and lessen delinquency.