In the Mormon fundamentalist movement, the 1886 Revelation is the text of a revelation said to have been received by John Taylor, third President of the Church of Jesus Christ of Latter-day Saints, on 27 September 1886, which restated the permanence of the principle of plural marriage. Along with Joseph Smith's 1843 revelation on plural marriage, the 1886 revelation is one of the primary documents used by Mormon fundamentalists to justify their continued practice of polygamy. The LDS Church, which issued manifestos in 1890 and 1904 to terminate the practice of plural marriage, does not accept the 1886 revelation as authentic.

Lorin Calvin Woolley was an American proponent of plural marriage and one of the founders of the Mormon fundamentalist movement. As a young man in Utah Territory, Woolley served as a courier and bodyguard for polygamous leaders of the Church of Jesus Christ of Latter-day Saints in hiding during the federal crusade against polygamy. His career as a religious leader in his own right commenced in the early twentieth century, when he began claiming to have been set apart to keep plural marriage alive by church president John Taylor in connection with the 1886 Revelation. Woolley's distinctive teachings on authority, morality, and doctrine are thought to provide the theological foundation for nearly ninety percent of Mormon fundamentalist groups.