The present study aimed to find out the gender difference in the academic achievement, resilience and conformity of adolescent schools students in Sri Lanka. Survey method with stratified random sampling technique has been followed for the present study. The sample consists of 740 students studying Grade-13 in the selected schools of Sri Lanka which includes 309 boys and 431 girls students. The researcher collected the academic achievement scores of the students from the school to measure the academic achievement of the students. Resilience scale constructed and validated by the investigator (2024) and conformity inventory constructed and validated by the Krishnadevi (2018) have been used to measure the resilience and conformity of the students respectively. The present study indicated that there is no gender difference in the academic achievement and resilience of adolescent students studying grade-13 in Sri Lanka. But there is gender difference in the conformity of the students. The conformity is high for the female students than the male students. It reveals that the female students are high conformers than the male students.