The Scopes trial, formally The State of Tennessee v. John Thomas Scopes, and commonly referred to as the Scopes Monkey Trial, was an American legal case from July 10 to July 21, 1925, in which a high school teacher, John T. Scopes, was accused of violating Tennessee's Butler Act, which had made it illegal for teachers to teach human evolution in any state-funded school. The trial was deliberately staged in order to attract publicity to the small town of Dayton, Tennessee, where it was held. Scopes was unsure whether he had ever actually taught evolution, but he incriminated himself deliberately so the case could have a defendant.

John Thomas Scopes was a teacher in Dayton, Tennessee, who was charged on May 5, 1925, with violating Tennessee's Butler Act, which prohibited the teaching of human evolution in Tennessee schools. He was tried in a case known as the Scopes Trial, and was found guilty and fined $100.