This study investigated the effects of cognitive restructuring and solution focused brief counselling techniques on self-concept of secondary school underachievers in Ilorin metropolis, Nigeria. Five (5) research questions and five (5) null hypotheses to guide the work. Quasi-experimental design involving pre-test post-test control group with two experimental and one control groups was adopted for the study. The population of the study comprises of fifty (50) identified students with low self-concepts underachievers from SSII. The purposive sampling procedure was used in selecting (45) samples and were grouped into treatment and control. Academic self-concept scale developed by Liu and Wang (2005) was the instrument adapted for the collection of data in this study. The ANCOVA statistical tool was used to test five hypotheses raised at 0.005 alpha level of significance. The findings showed that cognitive restructuring technique is effective in managing self-concept of secondary school underachievers (p = 0.000), solution focused brief counselling technique is effective in improving self-concept of secondary school underachievers (p = 0.000) in enhancing self-concept of secondary school underachievers. Comparing the two techniques, both were effective (p = 0.763)in improving self-concept of secondary school underachievers in Ilorin metropolis, Nigeria. The result found no significant differential effect of cognitive restructuring technique in improving self-concept of male and female secondary school underachievers in Ilorin metropolis, Nigeria (p = 0.359),no significant differential effect of solution focused brief counselling technique in improving self-concept of male and female secondary school underachievers in Ilorin metropolis, Nigeria (p = 0.341).The researcher recommended school counsellors and psychologists should be encouraged to use cognitive restructuring and solution focused brief counselling techniques in improving self-concept among secondary school underachievers. School counsellors and psychologists should be encouraged to use both techniques in improving self-concept of male and female senior secondary school underachievers.Also, teacher should be trained by the counsellors and psychologists on the use of cognitive restructuring and solution focused brief counselling techniques in enhancing self-concept of secondary school under achievers in Ilorin metropolis