Samuel Harrison Smith (13 March 1808 – 30 July 1844) was a younger brother of Joseph Smith, founder of the Latter Day Saint movement. Samuel was a leader in his own right and a successful missionary. Smith is commonly regarded as the first Latter Day Saint missionary following the organization of the Church of Christ by his brother, Joseph. One of the Eight Witnesses to the Book of Mormon's golden plates, Samuel Smith remained devoted to his church throughout his life.