Orpha Jane "Jennie" Murray Kemp was an American temperance movement leader, writer, and newspaper circulator, nationally known for her work with the Woman's Christian Temperance Union (WCTU), and for her Food Administration campaigning during World War I. For 50 years, Kemp was an active WCTU worker. She campaigned vigorously through California and Oregon in the interests of prohibition. She served as president of the Oregon WCTU and later as secretary of the National WCTU. Kemp was editor and publisher of Our Messenger, 1889–1903; circulation manager of The Union Signal, and The Young Crusader, 1903–12; and National WCTU press superintendent since 1912.