Helen Louise Bullock (née Helen Louise Chapel; April 29, 1836 – 1927) was a music educator, social reformer, suffragist, and philanthropist from the U.S. state of New York. For 35 years, she taught piano, organ and guitar. She gave up her profession of music, in which she had achieved some prominence, to become a practical volunteer in the work for suffrage and temperance. In 1889, she was appointed national organizer of the Woman's Christian Temperance Union (WCTU) and in that work went from Maine to California, traveling 13,000 miles (21,000 km) in one year. During the first five years of her work, she held over 1,200 meetings, organizing 108 new unions and secured over 10,000 new members, active and honorary.[1] She received in one year the largest two prizes ever given by the national WCTU for organizing work.[2]