School happiness is a state of emotional well-being that occurs through the alignment between the goals of the school and the goals of teachers, students, and other school stakeholders. Students who experience school happiness can improve their talents and skills. Student leadership is a concept that describes the behavior of students who are effective with an outstanding speech and behaviors compared to their peers and stand out with their unique approaches. The aim of this study is to examine the relationship between school happiness and student leadership and to determine the effect of school happiness on student leadership. The sample of this study, which is designed in the descriptive relational screening model, consists of a total of 470 students from either public or private elementary schools in Ankara in the 2022-2023 academic year. The school happiness scale was used to determine the level of school happiness and the student leadership scale was used to determine the level of student leadership. According to the findings, the perceived level of school happiness of the students in the sample is "always" and the level of leadership is "mostly". A positive and moderately significant relationship was found between school happiness and student leadership. As the level of school happiness increases, so does the level of student leadership. The impact of school happiness on student leadership is moderate and positive. Additionally, school happiness significantly predicts student leadership.