William Wines Phelps (February 17, 1792 – March 7, 1872) was an early leader of the Latter Day Saint movement. He printed the first edition of the Book of Commandments that became a standard work of the church and wrote numerous hymns, some of which are included in the current version of the Church of Jesus Christ of Latter-day Saints' (LDS Church) hymnal. He was at times both close to and at odds with church leadership. He testified against Joseph Smith, providing evidence that helped persuade authorities to arrest Smith. He was excommunicated three times and rejoined the church each time. He was a ghostwriter for Smith. Phelps was called by Smith to serve as assistant president of the church in Missouri and as a member of the Council of Fifty. After Smith's death, Phelps supported Brigha