Mormonism and Nicene Christianity have a complex theological, historical, and sociological relationship. Mormons express their doctrines using biblical terminology. They have similar views about the nature of Jesus Christ's atonement, bodily resurrection, and Second Coming as mainstream Christians. Nevertheless, most Mormons do not accept the doctrine of the Trinity as codified in the Nicene Creed of 325 and the Nicene-Constantinopolitan Creed of 381. Although Mormons consider the Protestant Bible to be holy scripture, they do not believe in biblical inerrancy. They have also adopted additional scriptures that they believe to have been divinely revealed to Joseph Smith, including the Book of Mormon, the Doctrine and Covenants, and the Pearl of Great Price. Mormons practice baptism and celebrate the sacrament of the Lord's Supper, but they also participate in other religious rituals. Mormons self-identify as Christians.

Mormons are a religious and cultural group related to Mormonism, the principal branch of the Latter Day Saint movement started by Joseph Smith in upstate New York during the 1820s. After Smith's death in 1844, the movement split into several groups following different leaders; the majority followed Brigham Young, while smaller groups followed Joseph Smith III, Sidney Rigdon, and James Strang. Most of these smaller groups eventually merged into the Community of Christ, and the term Mormon typically refers to members of the Church of Jesus Christ of Latter-day Saints, as today, this branch is far larger than all the others combined. People who identify as Mormons may also be independently religious, secular, and non-practicing or belong to other denominations. Since 2018, the LDS Church has emphasized a desire for its members be referred to as "members of The Church of Jesus Christ of Latter-day Saints", or more simply as "Latter-day Saints".