The Reed Smoot hearings, also called Smoot hearings or the Smoot Case, were a series of Congressional hearings on whether the United States Senate should seat U.S. Senator Reed Smoot, who was elected by the Utah legislature in 1903. Smoot was an apostle in the Church of Jesus Christ of Latter-day Saints, one of the top 15 leaders of the church. The hearings began in 1904 and continued until 1907, when the Senate voted. The vote fell short of a two-thirds majority needed to expel a member so he retained his seat.

The Church of Jesus Christ of Latter-day Saints, informally known as the LDS Church or Mormon Church, is a restorationist, nontrinitarian Christian denomination that is the largest denomination in the Latter Day Saint movement. The church is headquartered in the United States in Salt Lake City, Utah and has established congregations and built temples worldwide. According to the church, it has over 17 million members and over 99 thousand volunteer missionaries. As of 2012, the church was the fourth-largest Christian denomination in the U.S. As of 2023, the church reported over 6.8 million U.S. members.