This study was conducted to determine the instructional management practices and professional development of teachers in public secondary Schools in the Boston District, Division of Davao Oriental. This study employed the non-experimental quantitative research design utilizing a correlational method. The respondents of the study were 131 teachers, who utilized universal sampling to select the actual respondents. Mean and Pearson r correlation analyses were the statistical tools utilized in this study. Based on the findings obtained in this study, the level of instructional management practices and professional development of teachers were very high. There was a significant relationship between instructional management practices and professional development of teachers in public secondary schools. In the light of the forgoing findings and conclusions of this study, it is suggested in this study that instructional management practices and professional development of teachers in public secondary schools may be upgraded by the school heads particularly in the low result areas of the study like evaluating various academic journals, pedagogy, and inclusive practices to assess the teaching effectiveness within the standard education setting.