Healthy schools are places where teachers enjoy working with colleagues and students at the school level, school atmosphere and organizational health are factors that influence teacher effectiveness. the main objective of the study is to find out the significant difference between the effectiveness and demographic variables of school teachers. The study was conducted through descriptive survey methods and using simple random sampling techniques 300 school teachers were selected in Ariyalur district. The study found that there is a significant difference in the mean score of teacher effectiveness between the groups of school teachers with regard to gender and locality of school. the study also found that there is a significant positive correlation between teacher effectiveness and school organizational climate.

KEYWORDS: Teacher Effectiveness, School Teachers, School Organization Climate.