Leadership style is important for improving performance of organization. The aim of the study was assessing the effect of leadership styles on employees’ performance: at Case of Major General Hayelom Araya Military Academy. The main objective of this study was to examine the effect of different leadership styles (democratic, autocratic, and laissez-faire leadership styles) on employees’ performance. The study was used both descriptive and explanatory research designs. The study was used both qualitative and quantitative research approaches.rnThe data have been collected from 137respondents randomly selected employees. The data collected have been analyzed using statistical analysis, both descriptive and interferential ones.rnThe researcher used Descriptive and inferential statistical method for data analysis.rnThe findings showed that autocratic leadership style was the most dominant style at the military academy. Overall, scores shown democratic leadership style were found to be strongly positive correlated with employee performance.rnAutocratic and laissez-faire leadership style had no relationship with performance.rnThe researcher recommended that democratic leadership is the most effective leadership styles