This investigation adopted a correlational research design. This study aimed to establish whether work overload and organisational climate are predictors of burnout among primary school teachers in Lesotho. The sample comprised 350 primary school teachers. Data were collected through the use of the Maslach Burnout Inventory-Educators Survey, Overload Scale and School Environmental Questionnaire. Multiple regression analysis reveals that work overload and organisational climate are predictors of burnout among teachers. Pertaining to work overload, the study finds that primary school teachers in Lesotho are burdened with teaching many grades. In relation to organisational climate, the findings of the study are that teachers work under unfavourable working conditions.