This study aimed at exploring the contribution of teacher-school head relationship on job commitment in public secondary schools in Kasulu Town Council. The study employed mixed approach and a convergent parallel design. The participants involved in this study were 80 teachers and 4 heads of schools making a total of 84 participants. Data were collected through questionnaires and interviews. Quantitative data were analyzed using Statistical Packages for Social Science (SPSS) version 20 while qualitative data were analyzed through thematic analysis. The findings of the study revealed that positive relationship between teachers and school head contribute significantly on teachers’ job commitment. Also, it was indicated that little effort of the head of school in establishing good relationship with staff members contribute to poor teacher job commitment. Apart from that, some heads of schools who are trying to establish good relationships with teachers face some challenges including unethical conduct of teachers, inadequate teaching and learning materials and poor leadership skills. The study recommended that in order to improve teachers’ job commitment, good relationship between teachers and heads of schools should be established by providing frequent leadership workshops so that to equip school heads with different leadership skills as well as provision of seminars to teachers. Generally, in order to build a positive relationship between teachers and heads of school the appointed heads of school should be encouraged to adopt different leadership style by considering the present situation like maturation of teachers and level of job commitment. Also teachers should observe teachers’ professional ethics so that they can help them to behave in an expected manner.