Non-Violence, also known as The Knotted Gun, is a bronze sculpture located outside the headquarters of the United Nations in New York City by Swedish artist Carl Fredrik Reuterswärd of an oversized Colt Python .357 Magnum revolver with a knotted barrel and the muzzle pointing upwards. Reuterswärd made this sculpture after singer-songwriter and peace activist John Lennon was murdered.

The United Nations is an intergovernmental organization responsible for maintaining international peace and security, developing friendly relations among nations, achieving international cooperation, and being a center for harmonizing the actions of nations. The UN is headquartered on international territory in New York City.