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Dennis Michael Quinn (March 26, 1944 – April 21, 2021) was an American historian who focused on the history of The Church of Jesus Christ of Latter-day Saints (LDS Church). He was a professor at Brigham Young University (BYU) from 1976 until he resigned in 1988. At the time, his work concerned church involvement with plural marriage after the 1890 Manifesto, when new polygamous marriages were officially prohibited. He was excommunicated from the church as one of the September Six and afterwards was openly gay. Quinn nevertheless identified as a Latter-day Saint and continued to believe in many LDS teachings, though he did not actively practice the faith.