Church of the Firstborn or Church of the First Born may refer to:
"Morrisite" Latter Day Saint sect Church of the Firstborn (Morrisite), a Latter Day Saint sect formed in 1861 and extant until 1969
LeBaron Mormon fundamentalist group factions Church of the Firstborn (LeBaron family) Church of the Firstborn of the Fulness of Times, a Latter Day Saint sect formed in the 1950s by Joel LeBaron Church of the First Born of the Lamb of God, founded in 1972 by Ervil LeBaron
Dalton Mormon fundamentalist group Church of the First Born and General Assembly of Heaven, a Latter Day Saint sect formed by Terrill Dalton in 2004
See also General Assembly and Church of the First Born