Joel Franklin LeBaron (June 9, 1923 – August 20, 1972) was a Mormon fundamentalist leader in northern Mexico.

Beginning in 1936, the LeBaron family became close to Joseph White Musser, a leader of the young Mormon fundamentalist movement in Mexico.

Upon returning to northern Mexico, their parents and most of the members of the LeBaron family joined the new church.

In 1972, Ervil LeBaron established the rival Church of the Lamb of God and began teaching his followers that in accordance with the doctrine of blood atonement, Joel had to be executed for his sins.

Ervil LeBaron was eventually convicted in Utah for ordering the killing of rival Mormon fundamentalist leader Rulon C. Allred.