Mary Adelle Hazlett (1837 – May 17, 1911) was a women's suffrage leader from Hillsdale, Michigan. From the late 1860s to the 1870s, Hazlett was said to be involved in secret societies in the Michigan area. Aligning herself with the Republican Party, she traveled through the United States, giving speeches advocating for women's rights and republican candidates. In 1870, Hazlett was elected the president of the North Western Women's Suffrage Association. She appeared at several women's rights conventions during the 1870s, such as the Second Decade Meeting for the national women's rights movement, the Allen County Suffrage Society Convention, and the Michigan Convention, appearing alongside other women's suffragists like Elizabeth Cady Stanton. During 1886, she was an orator for Republican pr