Background: Teachers’ teaching commitment is a vital component of educational success because it directly influences students’ academic achievement and overall school performance. Objective: This study aimed to explore the influence of school principal leadership on teacher teaching commitment in Catholic elementary schools in Merauke, South Papua, Indonesia. Method: We utilized a quantitative research approach using a survey research design to obtain data from a total of 95 Catholic elementary school teachers in Merauke, South Papua, Indonesia. Obtained data were subjected to a quantitative statistical analysis using a simple linear regression analysis by employing Statistical Package for the Social Sciences version 25. Findings: The results of data analysis show a positive and significant effect of school principal leadership in teacher teaching commitment in Catholic elementary school teachers in Merauke, South Papua, Indonesia. Implication for Practice and Research: The findings the findings highlight the need to strengthen leadership capacity among school principals through continuous professional development and leadership training. Effective leadership fosters a supportive and collaborative school climate, which enhances teacher motivation and contributes to improved teaching quality and student learning outcomes. Educational authorities and stakeholders are encouraged to invest in leadership development initiatives as a strategic means to promote teacher commitment and sustain educational excellence.