The study explored the relationship between supervisory competence and managerial behavior of school heads in public elementary schools of Governor Generoso District. Also, it investigated the association of the involved variables and the domains of supervisory competence of school heads that significantly influence their managerial behavior. With the use of probability sampling, 74 public elementary teachers were selected as the respondents. Utilizing the descriptive-correlational survey method, the data collated were analyzed through the use of Mean, Product-Moment correlation and Regression Analysis. Results revealed that there was a high supervisory competence and a very high managerial behavior of the school heads. Furthermore, there was a significant relationship between supervisory competence and managerial behavior of the school heads. Moreover, all domains of supervisory competence of school heads, instructional supervision, professional competence, and motivational competence, were found to have significantly influence the management behavior of school heads. Based on the findings, it was further suggested that higher officials in the Department of Education may identify means on how to strengthen the supervisory competence of school heads which would boost their managerial behavior. More so, future researchers may further explore the involved variables considering other factors and research methods.