Leroy Sunderland Johnson, known as Uncle Roy, was a leader of the Mormon fundamentalist group in Short Creek, which later evolved into the Fundamentalist Church of Jesus Christ of Latter-Day Saints, from the mid-1950s until his death.

The Fundamentalist Church of Jesus Christ of Latter-Day Saints is a religious sect of the fundamentalist Mormon denominations whose members practice polygamy. It is variously defined as a cult, a sect, or a new religious movement.