The study investigated the effects of behavioural rehearsal technique on low self-concept among senior secondary school students in Orlu Local Government Area of Imo State. Two research questions and two null hypotheses tested at 0.05 level of significance guided the study. A Quasi-experimental design of pre-test, post-test non randomized control group was adopted for this study. Purposive sampling technique was used in selecting the sample of 88 low self-concept students out of a population of 340 identified low self-concept students. All the three groups were pre-tested and post-tested using Low Self-Concept Personality Scale (LSPS) designed by Akinade (2012). Data collected were analyzed using mean and ANCOVA. Results obtained from the study indicated that behavioural rehearsal was effective in reducing low self-concept among senior secondary school students. Behavioural rehearsal was more effective in reducing low self-concept of female secondary school students. The findings further revealed that the effect of behavioural rehearsal technique on low self-concept among senior secondary school students was significant. Bassed on the findings of the study, the researcher recommended among others that behavioural rehearsal technique be adopted as effective treatment strategy in helping students with low self-concept so as to enhance their performance both academically and socially.