Joseph Smith began secretly practicing polygamy in the 1830s and secretly teaching it in the 1840s, taking over 30 wives before his death in 1844. The Church of Jesus Christ of Latter-day Saints openly practiced polygamy in Utah from the 1840s until 1890 and did so secretly after 1890 for well over a decade. Although members of the LDS Church no longer practice polygamy, several Mormon splinter groups do. The articles here present the facts about polygamy, explain the relevance of the practice to the LDS Church’s claims to be the only true church on earth today, and introduce resources for further study of this issue.