Prentice Mulford (April 5, 1834 – c. May 30, 1891) was an American literary humorist and California author. In addition, he was pivotal in the development of the thought within the New Thought movement. Many of the principles that would become standard in the movement, including the Law of Attraction, were clearly laid out in his Your Forces and How to Use Them, released as a series of essays during 1886–1892.