Frank Channing Haddock (November 17, 1853 – February 9, 1915) was an influential New Thought and self-help author, best known for his multi-volume series The Power-Book Library.

[1] After graduation from Lawrence College, Appleton, WI in 1876, he first undertook training for the Methodist ministry but decided instead upon the field of law, and was admitted to the bar in 1881.

As a New Thought author and lecturer, he became well known for his teachings on will power, cultivation of the will, ethics, financial and business success, philosophy, and spirituality.

Like his contemporaries William Walker Atkinson and Charles F. Haanel, he exemplified the more secular and less overtly religious side of the New Thought movement.

Albert L. Pelton, an advertisement copywriter who read Haddock's work The Power of Will, became a devotee and published the book, selling over half a million copies.