The study was aimed at on examining the effects of teacher professional development on learners’ academic performance in Kumi district. Teacher professional development is one of the concerns among different stakeholders who have interest in education in most of the developed and developing nations. With a lot of pressure among the educators to improve the academic performance among the learners, teachers’ continuous professional development has become a necessity for the schools that are committed to improving the academic performance of their learners. Teachers' professional development refers to a continuous process of acquiring new knowledge, skills, and competencies to improve their teaching practices and enhance student learning outcomes. This development can take various forms and often involves both formal and informal learning opportunities. The study was guided by three objective (i) To examine the relationship between workshops and learners’ academic achievements ii to establish the relationship between teacher leadership and learners’ academic achievements iii To assess the relationship between motivation and learners academic achievements. The key aspects of professional development include online courses motivation, teacher leadership, workshops and seminars, mentoring, collaborative learning, in-service training, graduate education, peer observation and conferences. The purpose of this research paper was to find out how teachers professional development affects the academic performance of learners in primary schools in Kumi. This research was conducted in selected primary schools in Kumi district.