The present study aims to investigate whether there is any significant relationship between adjustment and academic achievement of higher secondary school students. In this survey study, the investigators used stratified random sampling technique for selecting the sample from the population. The stratification was done on the basis of gender and locality of students. The sample consists of 350 higher secondary school students from ten schools in Thanjavur District, TamilNadu, India. The tools used for the present study were Adjustment Inventory developed by A.K.P. Sinha and R.P. Singh (2007) and academic achievement constructed by the investigator. The statistical techniques used for analyzing the data for the present study was Karl Pearson's product moment co-efficient of correlation. The finding shows that, there is a significant relationship between emotional, social, educational adjustment of higher secondary school students in relation to academic achievement.