Gay bashing is an attack, abuse, or assault committed against a person who is perceived by the aggressor to be gay, lesbian, bisexual, or transgender (LGBT). It includes both violence against LGBT people and LGBT bullying. The term covers violence against and bullying of people who are LGBT, as well as non-LGBT people whom the attacker perceives to be LGBT.

Physical gay bashings sometimes involve extreme violence or murder motivated by the victim's sexual orientation, gender identity, or gender expression.

LGBT youth are more likely to report bullying than non-LGBT youth, particularly in schools. Victims of LGBT bullying may feel unsafe, resulting in depression and anxiety, including increased rates of suicide and attempted suicide. LGBT students may try to pass as heterosexual to escape the bullying, leading to further stress and isolation from available supports. Support organizations exist in many countries to prevent LGBT bullying and support victims. Some jurisdictions have passed legislation against LGBT bullying and harassment.