This research aims to investigate the influence of school principals' leadership, internal quality assurance systems, and school culture on the quality of teacher competence at SD Negeri 1 Kota Langsa. The population consists of 32 teachers at SD Negeri 1 Kota Langsa, and a total sampling technique was employed, involving the entire population as the sample. Data was collected through non-test methods using questionnaires and library studies as research instruments. Data analysis was conducted using the SPSS software, which included descriptive and regression analyses. The research findings reveal the following: Firstly, the leadership of the school principal has a significant and positive influence on the quality of teacher competence at SD Negeri 1 Kota Langsa. This underscores the vital role of the school principal in shaping the quality of teacher competence. Secondly, the study did not find a significant positive influence from the internal quality assurance system on the quality of teacher competence at the school, indicating that the internal quality assurance system might not yet play a significant role in enhancing teacher competence in this context. Thirdly, no significant positive influence was found from school culture on the quality of teacher competence at SD Negeri 1 Kota Langsa. This suggests that school culture may not be a dominant factor in shaping teacher competence. Lastly, the simultaneous test indicates that together, the leadership of the school principal, the internal quality assurance system, and school culture have a significant influence on teacher competence at this school. The primary conclusion is that the school principal's leadership plays a pivotal role in improving teacher competence, while the internal quality assurance system and school culture have not yet demonstrated a significant impact in this context.