This paper aims to present a preliminary picture of the first stage of an ongoing study on religiosity, spirituality and positive youth development among Muslim high-school students. The sample studied consisted of 895 students who attended secondary schools in the greater Kuala Lumpur region in Malaysia. The Exploratory factor analysis yielded an eight-factor solution with moderate-to-high internal consistency. The results of the statistical analyses indicated that Muslim female and male students scored significantly differently in these eight factors. When comparing the type of secondary schools attended, significant mean differences in students’ scores were also observed. Although these results are based on preliminary analysis, they underline important areas for future research on religiosity, spirituality and positive development among Muslim youth.