The Gay, Lesbian and Straight Education Network (GLSEN) "National School Climate Survey" is our flagship report on the school experiences of LGBTQ youth in schools, including the extent of the challenges that they face at school and the school-based resources that support LGBTQ students' well-being. The survey has consistently indicated that specific school-based supports are related to a safer and more inclusive school climate, including: supportive educators, LGBT-inclusive curriculum, comprehensive anti-bullying policies, and supportive student clubs, such as Gay-Straight Alliances (GSAs). The full GLSEN 2015 "National School Climate Survey" report includes information on LGBTQ middle and high school students' experiences, including: (1) Hearing biased language, from both students and educators; (2) Experiences of harassment and assault; (3) Anti-LGBTQ discrimination; (4) Effects of a hostile school climate on educational outcomes and psychological well-being; and (5) The availability and utility of supportive school resources. This report also examines demographic and school differences in students' experiences, as well as changes in school climate over time. In addition, for the first time, this installment of GLSEN's "National School Climate Survey" also includes insights on bisexual student experiences, school policies that specifically affect transgender students, and anti-bullying student education and asks students about discriminatory policies and practices around extracurricular activities and school events. [For the executive summary, "The 2015 National School Climate Survey: The Experiences of Lesbian, Gay, Bisexual, Transgender, and Queer Youth in Our Nation's Schools. Executive Summary," see ED574808.]