This study aimed at examining the influence of teacher’s professional development on job performance in public secondary schools in Ngara District.The research was guided by three objectives which were: To find out the existence of professional development programs in public secondary schools.To find out the Influence of teachers professional development on teachers job performance in public secondary schools in Ngara District, and To find out the strategies that can be used to improve Teachers’ Professional Development in public Secondary Schools in Ngara. The study adopted qualitative research approach with descriptive design. The study employed qualitative study approach in which descriptive research design was used whereby 38 participants participated in the study. Data were collected through open ended questionnaire and semi-structured interviews. The data were analyzed based on objectives and raised themes. The study showed that most of the teachers in Ngara district underperform in teaching practices due to inadequate professional development. The study concluded that there was no provision of professional development programs to teachers in Ngara district. The researcher recommends that teachers should be given enough in-service training by both the government and other identified education stakeholders. In addition, the researcher recommends the teacher to have attitude to change; this means instead of depending on the government to train them, they should seek to go for further studies and increase knowledge and skills which will help them to perform their duties at required standards of performance.