A descriptive survey was conducted to assess the correlation between study habits and academic achievements among high school pupils, in a nominated school at Alappuzha District, Kerala. Disproportionate stratified random selection was used to pick out 180 high school pupils. Information was collected by using the socio demographic questionnaire, Modified M. Mukhopadhaya's and D. N. Sansanwal's study habits inventory and the review of previous year progress reports. The data were tabulated and examined by means of descriptive and inferential measurements. The findings shown that the total mean score in study habits was 78.81 with SD 20.26 and the total mean score of academic achievements was 65.58 with SD 14.13. The calculated Karl Pearson correlation coefficient 'r' value (0.808) was greater than the table value (0.191) and the degree of freedom 178 at p<0.01 level of significance, indicating that there was a substantial positive correlation between Study Habits & the Academic Achievements of high school pupils. Hence, the study judged that a rise in study habits score will also raise the academic achievement score among high school pupils.