Outing is the act of disclosing an LGBT person's sexual orientation or gender identity without that person's consent. It is often done for political reasons, either to instrumentalize homophobia in order to discredit political opponents or to combat homophobia and heterosexism by revealing that a prominent or respected individual is homosexual. Examples of outing in history include the Krupp affair, Eulenburg affair, and Röhm scandal.

The ethics of outing are highly contested as it can often have a negative effect on the target's personal life or career. Some LGBT activists argue that gay individuals who oppose LGBT rights do not enjoy a right to privacy because of their perceived hypocrisy. In an attempt to pre-empt being outed, an LGBT public figure may decide to come out publicly first, although controlling the conditions under which one's LGBT identity is revealed is only one of numerous motives for coming out.