The study investigates the relationship between student engagement and mathematics achievement among VI-grade students, focusing on a lower secondary school in Paro, Bhutan. The researcher employed a descriptive survey method to collect data from 47 grade VI students using student engagement tools and mathematics achievement tests. Statistical analyses, including Pearson correlation and regression, were conducted to test the research objectives and hypotheses. Findings reveal a significant positive relationship between student engagement and mathematics achievement, supporting the hypothesis. Regression analysis further indicates that student engagement significantly predicts mathematics achievement, explaining 22.5% of its variance. These results underscore the importance of student engagement in enhancing academic outcomes and align with previous research. Overall, the study emphasizes the need for interventions to foster student engagement and improve mathematics performance among VI- grade students.