Mary Fels (née , Fels; March 10, 1863 - May 16, 1953) was a German-born American philanthropist, Georgist, Zionist, suffragist, economist, author, and journal editor. She was interested in all the different movements that supported democracy. She was an ardent supporter of equal suffrage, and was active in the promotion of Israel. Though she supported and encouraged her husband, Joseph Fels, in his campaign for economic justice, it was not until after his death that Mrs. Fels became active in the single tax movement. She established and supervised the Joseph Fels International Commission, which included welfare funds.