Abstract: The study examined the role of private sector in enhancing the quality of public secondary school in Central Senatorial district of Delta State, Nigeria. Three research questions were raised and three null hypotheses formulated to guide the study. The instrument designed were administered in person to 574 respondents made up of 52 principals and 522 teachers sampled from the target population of 152 principals and 4,408 teachers. A stratified random sampling technique was employed. The instrument was validated in its face and content values and found reliable at 0.77 reliability coefficient using the Spearman Brown Prophesy formula. Data collected were analysed with mean scores standard deviation and the three null hypotheses were tested using the Z-test at 0.05 level of significance. The findings showed that private sector has contributed to quality school buildings and that the private sector has not contributed to well equipped libraries and laboratories in the schools while government should make laws that will compel the private sector to participate actively in enhancing the quality of public secondary schools.