This is a survey study conducted to determine the perception of business studies teacher's on the influence of large class size in Yobe state public secondary school. Three research questions were raised to guide the study. The population comprised of one hundred and twenty (120) business studies teachers from one hundred and five (105) Secondary schools in Yobe state. A sample of ninety (90) Business studies teachers from seventy five (75) secondary schools were selected through a random sampling. Structured Questionnaire was used for data collection and the data was analyzed using mean. The findings of the study revealed that large class size has negative effect on Business studies teacher's as it affect their performance. It is therefore recommended that more schools and classrooms should be build and more teacher's be employed to ease teacher's activities for improved performance.