The Church of Jesus Christ of Latter-day Saints, informally known as the LDS Church or Mormon Church, is the largest denomination within the Latter Day Saint movement. Founded during the Second Great Awakening, the church is headquartered in Salt Lake City, Utah, and has established congregations and built temples worldwide. As of 2023, the church reports having over 17.2 million members, with over 6.8 million residing in the U.S. Additionally, the church has more than 99,000 volunteer missionaries and 350 temples globally.

The church was founded by Joseph Smith in 1830 as the Church of Christ in western New York. Under Smith's leadership, the church's headquarters moved successively to Ohio, Missouri, and Illinois. Following Smith's death in 1844, a succession crisis occurred, and the majority of his followers aligned with Brigham Young, who led the church to its current headquarters in Salt Lake City. Young and his successors further expanded the church's reach, first throughout the Intermountain West, and later as a national and international organization.

The church has faced criticism throughout its history, with modern critiques focusing on its historical claims, treatment of minorities, and financial practices. Its practice of polygamy was particularly controversial until it was curtailed in 1890 and officially rescinded in 1904.

Theologically, the church is restorationist and nontrinitarian, identifying as Christian with a belief in the doctrine of salvation through Jesus Christ and his substitutionary atonement. The church is often listed among larger Christian denominations, though some Catholics, mainline Protestants, and evangelicals regard it as distinct from mainstream Christianity.

The church maintains an open canon consisting of four scriptural texts: the Holy Bible, the Book of Mormon, the Doctrine and Covenants (D&C), and the Pearl of Great Price. Members adhere to laws of sexual purity, health, fasting, and Sabbath observance, and typically contribute ten percent of their income to the church in tithing. The church teaches ordinances through which adherents make covenants with God, including baptism, confirmation, the sacrament, priesthood ordination, endowment, and celestial marriage.

Members, known as Latter-day Saints or Mormons, believe that the church president serves as a modern-day "prophet, seer, and revelator" and that Jesus Christ, under God the Father's direction, leads the church by revealing his will to the president. The president oversees a hierarchical structure ranging from areas to stakes and wards. The church has a volunteer clergy at the local and regional levels, and wards are led by bishops. While male members may be ordained to the priesthood if living according to church standards, women are not ordained but hold leadership roles in some church organizations. The church operates a large missionary program, engaging in proselytizing and humanitarian efforts worldwide, with both men and women eligible to serve as missionaries. The church also funds and participates in humanitarian projects separate from missionary work.