This study sought to investigate the effect of covert positive reinforcement technique in reducing stealing tendency among secondary school students in Anambra State, Nigeria. One research question guided the study while one null hypothesis was 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 201 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 (STQ) designed by the researcher and validated by experts in measurement and evaluation. Data was collected for the study through direct delievery approach. Data collected were analyzed using Mean for answering hypothesis and ANCOVA in testing the hypothesis. Results obtained from the study indicated that Covert positive reinforcement technique is effective in reducing students’ stealing tendency in secondary school students technique was effective in reducing stealing tendency among secondary school students. Based on the findings, the researcher recommended among others that teachers should refer students identified with stealing tendency to the school guidance counsellors for proper diagnosis of the problem and counselling using the covert positive reinforcement technique.