William Dwight Porter Bliss (August 20, 1856 – October 8, 1926) was an American Christian Socialist writer, editor, and activist, as well as a pioneer historian of the world socialist movement.
William Dwight Porter Bliss was born in Constantinople, Turkey on August 20, 1856, the son of Christian missionaries there. He was educated at Phillips Academy, Andover and the Hartford Theological Seminary in Hartford, Connecticut.
Following his graduation in 1882, Bliss was ordained a Congregationalist minister. On June 16, 1886 he was ordained a deacon in the Episcopal Church, and became a priest on June 8, 1887. He then served at Grace Church in Boston from 1887 until 1890, when he helped organize an inner-city ministry, the Church of the Carpenter, where he served for four years.
During the 1880s, Bliss became interested in the writings of Charles Kingsley and Frederick Denison Maurice, which led him to Christian Socialism, a movement which sought to apply the teachings of Christ to modern social difficulties, caused, they believed, by industrialization and urbanization. In 1889 Bliss helped organize the first Christian Socialist Society in the United States. He also published and edited The Dawn, the society's official magazine. Bliss also joined the leftist-leaning Church Social Union, and remained with the Episcopal organization for decades, as well as lectured widely.
In 1887 Bliss ran to become the Lieutenant-Governor of Massachusetts as candidate of the Labor Party, but lost the election. He also worked as an investigator for the Bureau of Labor.