Daniel Sidney Warner (July 25, 1842 – December 12, 1895) is known primarily as a church reformer and one of the founders of the Church of God (Anderson) and other similar church groups. He is also known for some of his songs which other church groups have incorporated into their hymnody. He is mostly known by only the initials of his given and middle name, D. S. Warner, which was typical for his time period.