Mary Elizabeth Tyler (July 10, 1881 – September 10, 1924) was an Atlanta public-relations professional who, along with Edward Young Clarke, founded the Southern Publicity Association.

Like Clarke and the second Klan's initial organizer William Simmons, Tyler was active in fraternal organizations—in her case, in a women's auxiliary called the Daughters of America.

Starting in 1920, Tyler and Clarke were extremely successful in building the organization of the Klan and in promoting a broader agenda for it, including temperance, anticommunism, antisemitism, and anticatholicism.

Their sexual relationship was in tension with the prominent role played by the purity of white womanhood in the organization's foundational mythology, which revolved around the real-life figure of Mary Phagan and the film The Birth of a Nation, which featured the fictional martyr Flora Cameron.

In 1921, the Columbus Enquirer-Sun and the New York World published articles accusing Clarke and Tyler of financial and sexual misconduct.