Professional development is the cornerstone of enhancing teachers' practices and overall effectiveness in the ever-evolving landscape of education. This study explored the level of teachers’ professional development and teaching practices, their significant relationship and identify which of the professional development such as trainings, seminars, coaching and mentoring influence the teachers’ practices like teaching strategies and classroom management. A correlational and causal research design were employed with validity and reliability tested, researcher-made questionnaire. Survey was conducted to 123 elementary school teachers, taken through stratified random sampling using Slovin’s formula. Mean, Standard Deviation, Pearson Product Moment Correlation Coefficient and Multiple Linear Regression were the statistical tools used. Results revealed that teachers' professional development was at very high level, and teaching practices were very high. There was a strong positive correlation between professional development and classroom management. Moreover, teachers’ professional development influence teachers’ practices. It can be concluded that teachers’ professional development is essential in teachers’ best practices. Thus, a regular or continuous trainings and seminars, coaching and mentoring be given to teachers.