Mary Jane Aldrich (née, Johnston; March 19, 1833 – April 27, 1909) was an American temperance reformer, lecturer, and essayist of the long nineteenth century.

That movement fanned a latent interest into deep enthusiasm, brought out the hitherto undeveloped powers of her nature, and joined her to a work that she believed would serve everyone.

Quick in thought and prompt in action, she soon became a recognized worker, enjoying the consent and co-operation of her husband and children.

Made a vice-president of the National WCTU at its organization, November 18–20, 1874, she visited different localities to enlist women in the work of that society.

Chosen corresponding secretary of the Iowa WCTU in 1875, she held the office for one year only, leaving it in order to spend more time in the field.

[3] In 1885, Aldrich declined re-election as president of the Iowa State union because she was unable to give to the work all the time it required.

[3] She attended the convention held in Cleveland, Ohio, January 22–24, 1890, at which time the Non-partisan National WCTU was organized.