thumb|right|200px|Bystander intervention training aims to teach people to intervene at parties and dances when they see a person making sexual advances on an intoxicated person.
Bystander intervention is a type of training used in post-secondary education institutions to prevent sexual assault or rape, binge drinking and harassment and unwanted comments of racist, homophobic, or transphobic nature. A bystander is a person who is present at an event, party, or other setting who notices a problematic situation, such as a someone making sexual advances on a drunk person. The bystander then takes on personal responsibility and takes action to intervene, with the goal of preventing the situation from escalating. Advocates hope that bystander intervention programs can yield the same results on sexual assault that designated driver initiatives have had in reducing impaired driving; another similarity is that both programs do not discourage drinking itself, only the combination of drinking and law-breaking.