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.

John Taylor was an English-born religious leader who served as the third president of the Church of Jesus Christ of Latter-day Saints from 1880 to 1887. He is the first and so far only president of the LDS Church to have been born outside the United States.