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Acting President of the Quorum of the Twelve Apostles is a priesthood calling in The Church of Jesus Christ of Latter-day Saints.
In general, the position of Acting President of the Quorum of the Twelve Apostles is only filled when the President of the Quorum of the Twelve Apostles is called as a counselor in the First Presidency of the church. In such instances, the man who holds this calling is the most senior apostle who is not serving in the First Presidency. Additionally, a person may be called as the Acting President of the Quorum when the actual President of the Quorum is unable to perform his duties due to ill health or other incapacitation.
The formal calling of Acting President of the Quorum has been held seven times by six men: Rudger Clawson, Joseph Fielding Smith, Spencer W. Kimball, Howard W. Hunter, Boyd K. Packer, and M. Russell Ballard. Additionally, two earlier apostles—Orson Hyde and Brigham Young Jr.—have acted as President of the Quorum of the Twelve Apostles when they were not the second-most senior apostle in the church, and therefore may be said to have played the role of an Acting President of the Quorum before this specific title was created by the church.