Using nationally representative transcript data, this study is the first to include a discussion of religiosity in the context of sexual-minority students' academic achievement. This study examines the issue in three capacities: first, by comparing school success of sexual-minority youth to a non-sexual-minority reference group; second, by examining multiple facets of religiosity--including personal, parental, and peer factors--and their associations with the schooling success of sexual-minority youth and their heterosexual counterparts; and third, by exploring these issues across the three definitions of sexual-minority youth for both genders. The results indicate that whereas non-sexual-minority females with higher personal, parental, and peer religiosity tend to have higher grade-point averages (GPAs), sexual-minority males' school success is unrelated to the religiosity of their environments. (Contains 3 tables.)