Mary Traffarn Whitney (February 28, 1852 – March 8, 1942) was an American minister and editor, as well as a social reformer, philanthropist and lecturer. She was one of the early Universalist women ministers, later changing her association to that of the Unitarian church. Whitney was the author of Honor between men and women (1896), FamilyCulture, the Science of Human Life (1897), Present Tendencies in Racial Improvement (1897), Hymns of Peace (1915), and Problems for seniors by a senior (1932).