Algernon Sidney Gilbert (December 28, 1789 – June 29, 1834) was a merchant best known for his involvement with Latter-day Saint history and his partnership with Newel K. Whitney in Kirtland, Ohio. He is mentioned in seven sections of The Church of Jesus Christ of Latter-day Saints Doctrine and Covenants. He was ordained as a high priest in the state of Missouri and served as a missionary in the United States.