Henrietta Haynie Maddox (January 6, 1860 – February 19, 1933) was a vocalist, lawyer and suffragist. Maddox became the first woman in Maryland licensed to practice law in 1902. She fought for the rights of women to take the bar exam and practice law in the state of Maryland. She was a successful vocalist who studied at the Peabody Conservatory of Music before starting a second career as an attorney. She was the co-founder of the Maryland Woman Suffrage Association in 1894 and campaigned for equal pay for equal work. Maddox wrote the first Maryland suffrage bill introduced to the General Assembly on February 23, 1910.