LGBTQ slang, LGBTQ speak, queer slang, or gay slang is a set of English slang lexicon used predominantly among LGBTQ+ people. It has been used in various languages since the early 20th century as a means by which members of the LGBTQ+ community identify themselves and speak in code with brevity and speed to others. The acronym LGBT was popularized in the 1990s and stands for Lesbian, Gay, Bisexual, and Transgender. It may refer to anyone who is non-heterosexual or non-cisgender, instead of exclusively to people who are lesbian, gay, bisexual, or transgender. To recognize this inclusion, a popular variant, LGBTQ, adds the letter Q for those who identify as queer or are questioning their sexual or gender identity.

LGBTQ slang has played an integral part in LGBTQ+ culture for decades. Slang language initially emerged as a way for queer people to communicate with one another while avoiding detection by mainstream society. Queer people have always existed, but historically, they have had to be discreet about their identities and lives, particularly when being LGBTQ+ was illegal and or socially condemned.

LGBTQ slang is used as a way to signal one's identity and build solidarity within the community. When queer people use these certain words and phrases, they demonstrate to others that they are part of the LGBTQ+ community and share a common experience. This connection can create a sense of belonging for those historically rejected and isolated by mainstream society.

LGBTQ slang is also used by the community as a means of reclaiming language and deconstructing oppressive norms. Queer slang often includes playful references to sexual acts, which can serve as an assertion of sexual agency and a rejection of shame.