Jedediah Morgan Grant (February 21, 1816 – December 1, 1856) was a leader and an apostle of The Church of Jesus Christ of Latter-day Saints (LDS Church). He was member of the First Council of the Seventy from 1845 to 1854 and served in the First Presidency under church president Brigham Young from 1854 to 1856. He is known for his fiery speeches during the Reformation of 1856, earning the nickname, "Brigham's Sledgehammer". Grant is the father of Heber J. Grant, who later served as President of the Church.