Lebbeus Armstrong (1775–1860) was an American Presbyterian minister active in the early nineteenth century who served as pastor of the Congregational church in Moreau, Saratoga County, New York, and as a minister engaged in public moral and religious controversies of his day. Armstrong was also an author, publishing works such as Masonry Proved to Be a Work of Darkness and The Temperance Reformation, which reflect his involvement in the anti-Masonic and temperance movements of the period.