The present study would lead to know the effects of British Council training program on the primary school teachers in Khyber Pukhtunkhawa. The objective of the study was to know the effects of the training program on the primary school teachers. The primary school teachers, who successfully completed grade III training English as Medium of Instruction in Khyber Pukhtunkhawa, were the population of the study. The study was delimited to male primary school teachers of the three districts namely Mardan, Peshawar and Swabi. The target population was 1947 male primary school teachers, of whom 330 was selected. The data was collected through questionnaire and analyzed through percentage and chi-square. The results of the study that the primary school teachers were able to use English as Medium of Instruction. The study recommended that such trainings should be arranged for teachers to improve their skills of using English as Medium of Instruction.