Objective: Using multiinformant, multilevel modeling, this study examines the association between teacher/staff perceptions of school environment and student reports of homophobic name-calling and sexual harassment. Method: Surveys were conducted with 1,447 teachers/staff and 3,616 6th grade students across 36 middle schools in the Midwest. Results: Bivariate associations revealed that when teachers perceive schools as committed to bullying prevention, students reported less homophobic name-calling perpetration, sexual harassment perpetration, and sexual harassment victimization. When adults reported positive staff/student interactions, students endorsed lower levels of homophobic name-calling perpetration and victimization and less sexual harassment perpetration. Higher teacher/staff reported gender equity was correlated with less homophobic name-calling perpetration and victimization and sexual harassment perpetration. In a model with all school environment scales entered together, school commitment to prevent bullying was associated with less sexual harassment perpetration; in addition, higher gender equity and intolerance of sexual harassment at the school level was associated with fewer experiences of homophobic name-calling perpetration and victimization and sexual harassment perpetration. Conclusions: Efforts to address gendered harassment should include support from the school administration and professional development opportunities for all teachers and staff. Adults in the school should create a culture that is intolerant of sexual harassment and supports equality between the girls and boys in the school. (PsycINFO Database Record (c) 2016 APA, all rights reserved)