Abstract: This study aims to analyze the effect of mental health, ability, and work discipline on personnel performance simultaneously and partially and to identify variables that have the most dominant influence on personnel performance. The research location was at Adi Soemarmo Solo Airbase, Central Java. Data analysis techniques using descriptive methods and multiple linear regression analysis. The results showed that existing conditions could describe the variables of mental health, ability, and work discipline, so they became the primary basis of this research. Regression analysis proves that mental health, ability, and work discipline significantly affect personnel performance, which means that all three contribute together to improving work performance. In addition, partially, each variable also significantly influences individual performance. Among the three factors, work discipline has the most dominant influence on the quality of personnel performance. Therefore, improving work discipline is the main factor that needs attention to optimize the effectiveness and productivity of personnels' work. This research is expected to contribute to Lanud Adi Soemarmo Solo by suggesting several steps to improve personnel performance at Lanud Adi Soemarmo Solo, including attention to mental health, a supportive work environment, and regular training and evaluation to improve personnel skills.