LGBT or GLBT is an initialism that stands for lesbian, gay, bisexual, and transgender. In use since the 1990s, the term is an adaptation of the initialism LGB, which was used to replace the term gay in reference to the LGBT community beginning in the mid-to-late 1980s. Activists believed that the term gay community did not accurately represent all those to whom it referred.

Gay–straight alliances are school/student-led or community based organizations, found primarily in North American high schools, colleges and universities, that are intended to provide a safe, supportive environment for lesbian, gay, bisexual, transgender, and queer/questioning (LGBTQ) youth (or those who are perceived as such) and their straight allies.