Hannah Johnston Bailey (July 5, 1839 – October 23, 1923) was an American Quaker teacher, pacifist, activist, and advocate for peace, temperance, and women's suffrage.

[1] Although they were Quakers, two of her younger brothers fought in the American Civil War, and one died, cementing for Hannah Johnston a commitment to peace.

In 1887, she became head of the WCTU's new Department of Peace and Arbitration, and through the organization worked to oppose war and violence in all forms, including capital punishment, lynching, prizefighting, military conscription, even toy soldiers and military drills in schools.

[5] She was editor and publisher of two WCTU peace periodicals, Pacific Banner and Acorn (intended for young readers), from her home in Winthrop, Maine.

[6] From 1891 to 1899, she was president of the Maine Woman Suffrage Association, and from 1895 to 1899 she served as treasurer of the National Council of Women.