Boyd Kenneth Packer was an American religious leader and educator who served as president of the Quorum of the Twelve Apostles of the Church of Jesus Christ of Latter-day Saints from 2008 until his death. He also served as the quorum's acting president from 1994 to 2008 and was an apostle and member of the Quorum of the Twelve from 1970 until his death. He served as a general authority of the church from 1961 until his death.

President of the Quorum of the Twelve Apostles is a priesthood calling in the Church of Jesus Christ of Latter-day Saints. Normally, the president of the Quorum of the Twelve is the most senior apostle in the church, aside from the president of the church. When the president of the church dies, it is the president of the Quorum of the Twelve who becomes the new church president. The calling of President of the Twelve has been held by 27 men. 16 Quorum Presidents have subsequently become President of the Church. Since January 2018, Dallin H. Oaks has been the President of the Quorum of the Twelve. Since Oaks is also first counselor in the First Presidency, M. Russell Ballard served as acting president until his death on November 12, 2023. Jeffrey R. Holland became the new acting president on November 15, 2023.