Going postal is an American English slang term, used as a verb meaning to suddenly become extremely and uncontrollably angry, often to the point of violence and in a workplace environment. The term derives from a series of incidents from 1983 onward in which United States Postal Service (USPS) workers shot and killed managers, fellow workers, and members of the police or general public. Between 1986 and 1997, more than 40 people were killed in at least 20 incidents of workplace rage.

Following this series of events, the idiom entered common parlance and has been applied to murders committed by employees in acts of workplace rage, irrespective of the employer; and generally to describe fits of rage, though not necessarily at the level of murder, in or outside the workplace. This term first appeared in print on December 17, 1993 in the St. Petersburg Times.

On August 20, 1986, 14 employees were shot and killed and six wounded at the Edmond, Oklahoma, post office by a postman, Patrick Sherrill, who then committed suicide with a shot to the forehead.

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