No Man Knows My History: The Life of Joseph Smith is a 1945 book by Fawn M. Brodie, one of the first significant non-hagiographic biographies of Joseph Smith, the progenitor of the Latter Day Saint movement. No Man Knows My History was influential in the development of Mormon history as a scholarly field, though historians of Mormonism have since criticized the book for its methodological deficiencies, factual errors, and overt hostility to Smith.