This study sought to investigate the effect of self-management technique in reducing stealing tendency among secondary school students in Ika south Local Government Area of Delta state, Nigeria. Two research questions guided the study and two null hypotheses were tested at 0.05alpha levels of significance. A pre-test, post-test non-randomized control group quasi-experimental design was adopted and used for this study. A sample of 108 students with stealing tendency was selected from a population of 1282 students. A purposive sampling technique was used in choosing two schools in the area of the study. All the two groups were pre-tested and post-tested using stealing tendency Questionnaire (S.T.Q) designed by Okocha (2017). Data collected from the study were analyzed using Mean and ANCOVA. Results obtained from the study indicated that self-management technique was effective in reducing stealing tendency among secondary school students. Self-management was more effective in reducing female secondary school students stealing tendency than those of male. Based on the findings, the researcher recommended among others that self-management techniques be adopted as effective treatment strategy in helping students with stealing tendency so as to enhance their performance both academically, socially and otherwise.