Martin Wells Knapp (1853–1901) was an American Methodist minister who founded several institutions including the magazine God’s Revivalist in 1888, the International Holiness Union and Prayer League (which became the Pilgrim Holiness Church) in 1897, and God's Bible School, later known as God's Bible School and College, in Cincinnati, Ohio in 1900. He was a central figure of the more radical wing of the Holiness movement.