Abstract: The main objective of this study is to identify the determinants of Economics Students’ academic performance at Jimma University, Ethiopia. A Simple random sampling was used to select 100 students from senior students of Economics Department. The independent t-tests, pearson correlation and tobit model were used to investigate factors affecting students academic achievement. The outcome illustrates that university entrance exam score, family economic situation, sleep time and habit of study are the main determinants of students’ academic performance. However, sex, residential place, study time and recreation time were found insignificant. Finally, the study recommends that universities, students’ families and policy makers need to work hard towards improving students academic performance, by considering aforementioned determinants.