Oliver Cowdery, American religious leader (b. 1806)
Oliver H. P. Cowdery (October 3, 1806 – March 3, 1850) was, with Joseph Smith, an important participant in the formative period of the Latter Day Saint movement between 1829 and 1836. He was the first baptized Latter Day Saint, one of the Three Witnesses of the Book of Mormon's golden plates, one of the first Latter Day Saint apostles, and the Second Elder of the church.

In 1838, as Assistant President of the Church, Cowdery resigned and was excommunicated on charges of denying the faith. Cowdery claimed Joseph Smith had been engaging in a sexual relationship with Fanny Alger, a teenage servant in his home. Cowdery became a Methodist, and then in 1848, he returned to the Latter Day Saint movement.