The objectives of the study are to examine impact of classroom environment on the academic performance of students in English language as well as their performance difference by gender. Survey and Correlation research designs were employed. The population of the study involved 183 teachers and 2003 SS III students in the selected schools. 401 students representing 20% and 183 teachers were randomly selected. Self-developed questionnaire and profoma were used for collection of data for this study. The data collected were analysed using descriptive statistics of Mean and Standard Deviation and Multiple Regression Analysis. The findings of the study revealed that classroom environment has strong impact on the academic performance of students in English language. On the gender basis, there was no significant difference in the performance of students. Therefore, it was recommended that school management should provide all necessary facilities in the classroom in order to create enabling environment for students overall development.