Abstract: This study investigated, the effect of principals leadership behaviour on school culture in some selected secondary schools in Ado-Ekiti, Nigeria. A descriptive survey design was employed. The study population comprised all the secondary schools in Ekiti State. About 65 schools were randomly selected out of 161 secondary schools in the state. The instrument used to collect data was questionnaire tagged Teachers Perception of Principal�s Leadership and School Learning Questionnaire (TPPLSLQ). Data collected were analysed three hypotheses were tested using the spearman rank correlation and the one way ANOVA. The findings show that leadership behaviour of a school principal affects the school learning. Based on the findings, it was recommended that a better understanding of leadership behaviour should be learnt by the school principal through regular attendance of seminars or workshop on leadership and school management.