Mary Jane Aldrich (née , Johnston; March 19, 1833 – April 27, 1909) was an American temperance reformer, lecturer, and essayist. She served as vice-president of the National Woman's Christian Temperance Union (WCTU) and president of the Iowa union. At the time of the division in the ranks of the WCTU, Aldrich, with the Iowa union, adhered to the non-partisan temperance work, and became evangelistic secretary of the Non-Partisan National Woman's Christian Temperance Union. As a temperance worker, she was characterized as sanguine and practical. As a speaker, she was bright, forceful, entertaining and logical. She was the author of "Church and Sunday School Temperance Work" (1898).