This paper compares and analyses the supervisory practices in the public secondary schools of Philippines and Thailand. The paper, however, does not focus on comparison, but the identification of various supervisory practices in Thailand and Philippines, which both fall under the category of developing nations, so as to determine the relevance and effectiveness of those practices, because the purpose of the paper is to identify the supervisory practices in Philippine schools that could be adapted, with modifications, in Thailand secondary schools. Data was gathered using a normative-survey technique and through interviewing selected supervisory officials from both countries. The participants of this study were teachers, principals, supervisors and department heads from Manila and Quezon city in the Philippines and Thonburi and Bangkok in Thailand. The study was limited to gaining information in regards to supervisory practices from selected representative secondary schools in the cities of Philippines and Thailand. The paper concludes that the a few supervisory practices being utilized in the Philippines can be used to improve the supervisory situation in the public secondary schools of Thailand.