Mary G. Harris Jones (baptized 1837; died 1930), known as Mother Jones, was an Irish-born American schoolteacher and dressmaker who became a prominent organized labor representative and . She helped coordinate major strikes and cofounded the Industrial Workers of the World.
Jones worked as a teacher and dressmaker, but after her husband and four children all died of yellow fever in 1867 and her dress shop was destroyed in the Great Chicago Fire of 1871, she began working as an organizer for the Knights of Labor and the United Mine Workers union. From 1897, at about 60 years of age, she was known as Mother Jones. In 1902 she was called "the most dangerous woman in America" for her success in organizing mine workers and their families against the mine owners. In 1903, to protest the lax enforcement of the child labor laws in the Pennsylvania mines and silk mills, she organized a children's march from Philadelphia to the home of President Theodore Roosevelt in New York.