Bukola Aderayo AROJOJOYE2024-05-212024-05-212022-12Kate TurabianM.Schttps://repository.lcu.edu.ng/handle/123456789/188This study was carried out to investigate principals’ leadership styles and instructional supervision as determinants of secondary school teachers’ job commitment in Oyo State as literature shows scarcity of studies on this subject area. The path-goal theory and theory X and Y guided the study. Four research questions and two hypotheses were formulated. Descriptive survey research design was employed. Study population comprised of all public secondary school principals (625) and teachers (14,508) of which 160 principals and 2076 teachers were sampled using multi-stage sampling technique. Interview and Questionnaires titled - "Principals' Leadership Styles and Instructional Supervision Questionnaire (α = .881)"and "Teachers’ Job Commitment Questionnaire (α = .831)" were used. Data was analysed using descriptive and inferential statistical methods. Results revealed low level of teachers’ commitment to the school (x̅=2.430), student (x̅=2.473) and profession (x̅=2.377); autocratic (x̅=2.524) and laissez-faire (x̅=2.562) except democratic (x̅=2.454) leadership styles are mostly employed by the principals and instructional supervision (x̅=2.421) in areas of classroom visitation (x̅=2.309) and workshop/seminar (x̅=2.346) is done at a little frequent level. Hypotheses showed a significant combined influence of principals' leadership styles and instructional supervision on teachers' job commitment in public secondary schools in Oyo State (F3, 156 = 2.780; Significance = .012; P<0.05). It also showed that autocratic (Beta = -.109; t = -2.159) and laissez-faire leadership styles (Beta = -.120; t = -2.557), classroom visitation/observation (Beta = .116; t = 2.494) and workshop/seminar supervision processes (Beta = .122; t = -2.573) are relatively significant at P<0.05. It can be concluded that principal leadership styles and instructional supervision affects teachers’ job commitment in Oyo state public secondary schools. It was recommended amongst others that principals should employ better leadership styles and carry out supervision regularly for improved teachers’ job commitment. Keywords: Leadership style, Instructional supervision, Teachers' job commitment Word Count: 260enThesis