This study investigated tenth- and twelfth-grade adolescents' ( N = 264) beliefs about homosexuality, their attitudes about gay and lesbian peers in school, and their evaluations of the treatment of gay, lesbian, and gender non-conforming peers. The results revealed differences in adolescents' beliefs about homosexuality and their attitudes toward gay and lesbian peers in school. Further, age-related and context differences in adolescents' attitudes were obtained. The results also revealed age-related difference in adolescents' evaluations of the treatment of gay, lesbian, and gender non-conforming peers. Finally, the results provide some evidence that gender non-conformity and sexuality independently and interdependently impact adolescents' evaluations of the treatment of others. The implications of these results for educators and others interested in creating schools that are safe for all students are discussed. (Contains 4 notes and 5 tables.)