Helen Marot (June 9, 1865 – June 3, 1940) was an American writer, librarian, and labor organizer. She is best remembered for her efforts to address child labor and improve the working conditions of women. She was from Philadelphia, USA and became active in investigating working conditions among children and women. As a librarian, she worked at several important institutions and helped organize the Free Library of Economics and Political Science in 1897. Marot was a member of the Women's Trade Union League. She later organized the Bookkeepers, Stenographers and Accountants Union in New York. In 1912, she was part of a commission that investigated the Triangle Shirtwaist Factory Fire. She was an active writer and her articles about the labor movement appeared in many periodicals of the day.