This study aims to determine and analyze the influence of human capital on teacher performance through discipline and professionalism at Technical Implementation Unit (UPT) State Senior High School (SMAN) 5 Jeneponto. This research was conducted at UPT SMAN 5 Jeneponto, which lasted for approximately 2 (two) months from October to November 2020. This study used a causality design with a quantitative approach. The population in this study were all teaching staff, both civil servants and contract workers. And honorarium at UPT SMAN 5 Jeneponto, namely 79 people. The sampling technique used saturated sampling so that the final sample used was 79 teachers. Data collection techniques through observation, interviews, questionnaires, and documentation, while data analysis by path analysis. The results showed that teachers' performance at UPT SMAN 5 Jeneponto could be improved by human capital, human capital as an essential school asset that needs to be maintained and continuously developed. The role of human capital at UPT SMAN 5 Jeneponto is strongly dominated by the better level of skills, motivation, organizational conductivities, team effectiveness, and teacher leadership. Discipline is also an important variable that drives the improvement of teacher performance at UPT SMAN 5 Jeneponto. Teachers' high work discipline is reflected in improving attitudes through punctuality in coming and going, obeying rules, wearing uniforms, completing work, and responsibility in assignments. In addition, professionalism is also considered an essential factor that encourages the improvement of teacher performance at UPT SMAN 5 Jeneponto. Professionalism is getting better with better teaching skills, implementation of broad insight, teacher mastery of curriculum and learning media, mastery of technology, and a reflection of personality and role models. Indirect influence, discipline, and professionalism become a good moderating variable in this study. Human capital can improve performance and encourage an increase in teacher discipline and professionalism, leading to improved teacher performance.