Horatio Willis Dresser (January 15, 1866 – March 30, 1954) was a New Thought religious leader and author in the United States.

In addition to his writings on New Thought, Dresser is known for having edited two books of selected papers by Phineas Parkhurst Quimby.

Horatio's father accused Eddy of stealing Quimby's concepts and using them as a basis for her system of Christian Science.

In 1900 the Atlanta Constitution described him in the following terms: Tall and slender, with a finely modeled head, which is poised on a magnificent pair of shoulders; his general athletic appearance indicates something more than mere student ... His delivery is plain, straightforward, and unadorned with the flowers of rhetoric.

In this work, Dresser re-opened the controversy concerning Quimby and Mary Baker Eddy, and her sources for developing Christian Science.

[7] The work was heavily edited and highly selective, and Dresser chose to publish only what supported his and his parents' claims.

[8] According to Ann Taves, "Dresser used the psychology of the subconscious to reinterpret the writings of Phineas Quimby and provide a unified theoretical foundation for the dissenting mind-cure groups under the banner of New Thought.