The Church of Christ was the original name of the Latter Day Saint church founded by Joseph Smith. Organized informally in 1829 in upstate New York and then formally on April 6, 1830, it was the first organization to implement the principles found in Smith's newly published Book of Mormon, and thus its establishment represents the formal beginning of the Latter Day Saint movement. Later names for this organization included the Church of the Latter Day Saints, the Church of Jesus Christ, the Church of God, the Church of Christ of Latter Day Saints, and the Church of Jesus Christ of Latter Day Saints.

The Church of Jesus Christ is an international Christian religious denomination headquartered in Monongahela, Pennsylvania, United States. Organized at Green Oak, Pennsylvania, U.S.A. in the year 1862. The church is a Christian Restorationist church and accepts the Book of Mormon as scripture. The church considers itself the gospel restored, or the original church and good news as established by Jesus Christ in the New Testament, restored upon the earth. It also claims to be the spiritual successor to the Church of Christ, organized by Joseph Smith on April 6, 1830. The church sees Sidney Rigdon as Smith's rightful successor following the assassination of Smith because Rigdon was Smith's first counselor in the First Presidency. The church is not officially affiliated with any other church, organization or denomination.