Workplace behaviour refers to behaviour that organization requires or demands of employees at all times which will encourage efficient running of the organization and subsequently lead to the attainment of the goals. Drawing from empirical studies and review of theories, this study examined the relationship between workplace behaviour and staff job performance in private secondary schools in Ilorin West local government, Kwara state, Nigeria. Specifically, the study assessed: (i) the relationship between punctuality and staff job performance in private secondary schools in Ilorin West local government, Kwara state, Nigeria; (ii) the relationship between teamwork and staff job performance in private secondary schools in Ilorin West local government, Kwara state, Nigeria and (iii) the relationship between discipline and staff job performance in private secondary schools in Ilorin West local government, Kwara state, Nigeria. The study was a descriptive research of correlation type, random sampling technique was used to select 50 private secondary schools in Ilorin West local government. Random sampling technique was used to select 10 staff per school. Purposive sampling technique was used to select administrative officers (Proprietors, Principals, Vice-Principals and Bursars). Questionnaire was used to collect data for the study, the instruments were validated by the experts and also tested for reliability. The reliability coefficients realized for WPQ and SJPQ were 0.82 and 0.76, respectively. The main and operational hypotheses were tested using Pearson product-moment correlation statistics respectively at 0.05 level of significance. The results revealed that there was a significant relationship between workplace behaviour and staff job performance (p˃0.05). The study concluded that workplace behaviour plays a significant role in enhancing staff job performance which would consequently facilitate the realization of educational goals of secondary schools in Ilorin-West local government, Kwara state, Nigeria. Based on the findings and conclusion, the study recommended that education stakeholders, including state government, should intensify their efforts to ensure that staff maintain workplace behaviour through strict implementation of staff code of conduct, the staff should be sensitized on the importance and consequences of workplace behaviour and ensure that appropriate sanctions are carried out on the defaulters. Keywords: workplace behaviour, job performance, private secondary schools