Samuel Davies Alexander (May 3, 1819 – October 26, 1894) was an American Presbyterian minister born in Princeton, New Jersey, the son of clergyman Archibald Alexander, who graduated from Princeton College and Princeton Theological Seminary before being ordained in 1847. After early pastorates in Port Richmond, Philadelphia and Freehold, New Jersey, he served for many years (1855–1893) as pastor of the Phillips Presbyterian Church (formerly Fifteenth Street Church) in New York City, and was awarded an honorary S.T.D. by Washington College in 1862. Alexander also authored historical and ecclesiastical works such as Princeton College during the Eighteenth Century(1872) and History of the Presbyterian Church in Ireland.