Ammon Ashford Hennacy (July 24, 1893 – January 14, 1970) was an American Christian pacifist, anarchist, Wobbly, social activist, and member of the Catholic Worker Movement.

He established the Joe Hill House of Hospitality in Salt Lake City, Utah, and practiced tax resistance.

During this time, Hennacy was a card-carrying member of the Socialist Party of America and in his words "took military drills in order to learn how to kill capitalists.

[4]: 224–25 Hennacy believed that adherence to Christianity required being a pacifist and, because governments constantly threaten or use force to resolve conflicts, this meant being an anarchist.

[5] He illegally refused to participate in New York City's annual air raid drills, and he picketed against the Atomic Energy Commission's war preparations in Las Vegas, Cape Kennedy, Washington, D.C., and Omaha.

[8] He wrote about his reasons for leaving and his thoughts on Catholicism, which included his belief that "Paul spoiled the message of Christ" (see Jesusism).

He wrote about this in The Book of Ammon in 1965 (an updated version of his 1954 Autobiography of a Catholic Anarchist), which has been praised for its "diamonds of insight and wisdom" but criticised for its rambling style.

His second and last book, The One-Man Revolution in America, was published in 1970 and consists of seventeen chapters with each one devoted to an American radical.

These included Thomas Paine, William Lloyd Garrison, John Woolman, Dorothy Day, Eugene Debs, Malcolm X, Mother Jones, Clarence Darrow, and Albert Parsons.

[9] In accordance with his wishes, his body was cremated and the ashes scattered over the graves of the Haymarket anarchists in Waldheim Cemetery in Chicago.