In Edmond, Oklahoma, U.S. Postal employee Patrick Sherrill guns down 14 of his co-workers and then commits suicide.

Edmond is a city in Oklahoma County, Oklahoma, United States. It is a part of the Oklahoma City metropolitan area, located in Central Oklahoma. Its population was 94,428 according to the 2020 United States census, a 16% increase from 2010. making it the 5th most populous city in Oklahoma.

The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas and associated states. It is one of a few government agencies explicitly authorized by the Constitution of the United States. As of March 29, 2024, the USPS has 525,377 career employees and nearly 114,623 pre-career employees.

The Edmond post office shooting was a mass shooting that occurred in Edmond, Oklahoma, on August 20, 1986. In less than fifteen minutes, 44-year-old postal worker Patrick Sherrill pursued and shot several coworkers, killing 14 and injuring another 6, before committing suicide. It is currently the deadliest workplace shooting in U.S. history, as well as the deadliest shooting by a lone gunman in the state of Oklahoma.