The study investigated the influence of motivational factors on teachers' commitment in public Secondary School in Mbale Municipality. The study employed Cross-sectional survey design. The sampling technique used to select was simple random sampling technique. The instrument used to collect data was a self designed questionnaire. The data collected was analyzed using frequency and percentages, Pearson correlation coefficient (bivariate statistics) and regression analysis. The study found a positive and significant influence of promotion on teacher's commitment with a (Sig = 0.000), findings showed reward system and teachers commitment were statistically significant at (Sig = 0.000) and that there was a low significant relationship between training and development and teachers commitment with a (sig = 0.002). Recommendations of the study were; Regarding the influence of promotion, the study recommends that schools and stakeholder should ensure fairness in promotion procedure process, create a constant promotion activities and should increase salary if teacher is been promoted. This can be achieved by ensuring that promotion should be done on merit, experience and skills. Teachers should be remunerated well to motivate them to enhance commitment. This can be achieved through offering incentives to teachers and rewarding teacher's whose students perform better in a subject. Not only that, non-monetary incentive should also be considered like recognition, offering gift to teachers and appreciation from the head teacher. Pension packages of teachers should be improved in terms of the lump sum and monthly allowance. This will give teachers a sense of security in their old age and as a result they will remain focus and committed to their work.