The purpose of the study was to explore the perception of Science teachers and school Principals about the training needs of science teachers in classroom assessment practices at the secondary level in two sampled districts of Malakand division. The population of the study comprised the science teachers and principals of two districts Swat and Malakand. The study was descriptive and quantitative. The data were collected by using survey questionnaires and analysed by using appropriate statistics through SPSS version 26. The results indicated that both science teachers and principals were not satisfied with science teachers’ classroom assessment practices and added that they may need intensive training in classroom assessment practices at the secondary level. Therefore, it was recommended that the science teachers should be trained in theory and classroom assessment practices for continuous formative assessment and feedback.