John Wayne Gacy (March 17, 1942 – May 10, 1994) was an American serial killer and pederast who raped, tortured, and murdered at least 33 young men and boys. Gacy regularly performed at children's hospitals and charitable events as "Pogo the Clown" or "Patches the Clown", personas he had devised.

He became known as the Killer Clown due to his public services as a clown prior to the discovery of his crimes. Gacy committed all of his murders inside his ranch house near Norridge, a village in Norwood Park Township, metropolitan Chicago, Illinois. Typically, he would lure a victim to his home and dupe him into donning handcuffs on the pretext of demonstrating a magic trick.