Abstract: This study aims to analyze the influence of work motivation, work discipline, and work environment on employee performance, both simultaneously and partially. In addition, this study also identifies variables that have a dominant influence on employee performance. The research location was at the Ministry of Defense of the Republic of Indonesia, Central Jakarta. Data analysis techniques using descriptive methods and multiple linear regression analysis. The results showed that work motivation, discipline, work environment, and employee performance can be described by the actual conditions at the Ministry of Defense, which is the background of this study. Simultaneously, work motivation, discipline, and environment significantly affect employee performance. In addition, partially, each of these variables also has a significant effect on employee performance. Work motivation has the most dominant influence on improving employee performance in the three variables studied. This shows that work motivation and intrinsic and extrinsic encouragement are important in encouraging employees to carry out their duties optimally and responsibly. This research is expected to enrich the understanding of the importance of work motivation, work discipline, and work environment on employee performance at the Ministry of Defense. In addition, the results of this study are expected to be a reference in managing human resources effectively to improve overall organizational performance.