In the Latter Day Saint movement, an apostle is a "special witness of the name of Jesus Christ who is sent to teach the principles of salvation to others." In many Latter Day Saint churches, an apostle is a priesthood office of high authority within the church hierarchy. In many churches, apostles may be members of the Quorum of the Twelve and First Presidency of the church. In most Latter Day Saint churches, modern-day apostles are considered to have the same status and authority as the Biblical apostles.

In the Latter Day Saint movement, priesthood is the power and authority of God given to man, including the authority to perform ordinances and to act as a leader in the church. A group of priesthood holders is referred to as a quorum.