Truth Seeker was an American periodical published beginning during the 19th century. It was considered the most influential Freethought publication during the period following the Civil War into the first decades of the 20th Century, known as the Golden Age of Freethought. Though there were other influential Freethought periodicals, Truth Seeker was the only one with a national circulation. The headquarters is in San Diego, California.
In the first issue, on September 1, 1873, editor D. M. Bennett and his wife Mary proclaimed that the publication would devote itself to: "science, morals, free thought, free discussions, liberalism, sexual equality, labor reform progression, free education, and whatever tends to elevate and emancipate the human race."
Subsequent editors included Eugene and George E. Macdonald, Charles Lee Smith (along with his associate editors Woolsey Teller and later Robert E. Kuttner), James Hervey Johnson, Bonnie Lange, Nicholas Rocha, Linda Hironimus, and Roderick Bradford.
- Susan Jacoby. Freethinkers: A history of American Secularism. New York, NY: Metropolitan Books. pp. 155–156.
- "George E. Macdonald". ffrf.org.
- "Truth Seeker Journal of Freethought Since 1873". truthseekerjournal.com. Archived from the original on 2 April 2012. Retrieved 23 July 2015.
- "Title Page of "Truth Seeker" from Volume 139 (2012)". Archived from the original on 13 June2016. Check date values in:
- "Truth Seeker Company". truthseeker.com. Archived from the original on 27 April 2014. Retrieved 28 August 2015.
- "Contact Us - The Truth Seeker". thetruthseeker.net.
- "Jackson v. Truth Seeker Co., Inc., 884 F. Supp. 370 - Dist. Court, SD California 1994".