Ervil Morrell LeBaron (February 22, 1925 – August 15, 1981) was the leader of a polygamous Mormon fundamentalist group who ordered the killings of many of his opponents, using the religious doctrine of blood atonement to justify the murders. He was sentenced to life in prison for orchestrating the murder of an opponent, and died there in 1981. He had at least 13 wives in a plural marriage, several of whom he married while they were still underage, and several of whom were involved in the murders.