                    The purposes of this study were to study the  leadership behavior of school administrator,  and to determine the correlation between leadership behavior and school effectiveness under Chonburi  Provincial Administrative Organization. 
        	The samples of the study were 242 administrators  and teachers from Chonburi Provincial Administrative  Organization. The tools  of  data  collection  consisted  of  the  questionnaires  in  5 rating scales, which had the reliability of .90. The statistics of analysis of data were mean, standard deviation and Pearson  product moment correlation.
        	The results showed  that:
        	1. The school administrator had leadership behavior in the high level which were task-oriented behaviors, change-oriented behaviors and relation-oriented behaviors respectively.
                   	2. The school effectiveness under  Chonburi Provincial Administrative Organization was found in the high level which were adaptability, solving problems, productivity and positive attitude respectively.
       	         3. The analysis of correlation showed that leadership behavior and school effectiveness under Chonburi Provincial Administrative Organization which was a positive way with statistically significant difference at the level of  .05
