This thesis examines the effect of leadership style on employee performance at the Addis Ababa City Administration Health Bureau in Ethiopia. The study aims to determine the influence of different leadership styles (transformational, transactional, laissez-faire, and autocratic) on employee performance. A survey was conducted of 201 employees to understand their perceptions of leadership style and performance. The results found that transactional leadership had the most positive effect on performance, while autocratic leadership had a negative effect. It was also found that employees desired more involvement in decision-making. The study recommends that the Bureau adopt a stronger transactional leadership approach to improve employee motivation and organizational goals.