The study investigated the causes and impact of stress on Teachers’ productivity as expressed by primary school teachers in Nigeria. A total 300 primary school teachers were randomly selected to form participants for the study. Four research questions formulated were directed towards issues investigated. A validated Instrument titled “Causes and Impact of Stress on Teachers Productivity Questionnaire” was administered to the participants. The survey research type was employed. Data collected were subjected to percentage analysis of variance and t-test analysis. The result revealed that majority of primary school teachers were stressed on the job and this had negative impacts on their productivity. The study revealed that lack of job satisfaction, inadequate school facilities, were major causes of stress among primary school teachers. The study also revealed that stress had negative impacts on teachers’ productivity. The study recommended the need for government to improve teachers’ conditions of service; teachers special salary scale to be implemented by government; adequate facilities should be provided in schools; establishment of counselling unit in schools to cater for both teachers and students. If the predisposing factors for stress are left unattended to, resultant consequences can have substantial effects on teachers’ productivity.