ABSTRACT The study investigated the relationship between organisational climate and teaching effectiveness in public secondary Schools in Imo State. The organisational climate indices of interest were openness of the school climate, institutional integrity, principal’s influence, initiating structure, consideration behaviour, resource support, morale of teachers and academic emphasis. Eight specific objectives, research questions and null hypotheses were respectively formulated to guide and direct the study. Review of literature was done under two broad headings: (theoretical and Conceptual/empirical Frameworks). The ex-post factor correlational design was employed for the study.