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Alvin Rulon Dyer (January 1, 1903 – March 6, 1977) was an apostle in the Church of Jesus Christ of Latter-day Saints (LDS Church) and served as a member of the church's First Presidency from 1968 to 1970.
Born in Salt Lake City, Utah, Dyer was ordained as apostle on October 5, 1967, (but was not added as a member of the Quorum of the Twelve Apostles) and subsequently was set apart as a counselor in the First Presidency to church president David O. McKay. After McKay's death in 1970, Dyer was returned to a position as an Assistant to the Twelve Apostles, and later to the First Quorum of the Seventy when it was reconstituted in 1976. Dyer is the only person in the LDS Church's history to serve in the First Quorum of Seventy after having been ordained to the office of Apostle.