Blanche Pentecost Bagley (January 19, 1858 – August 14, 1928) was a British-born American Unitarian minister. She and her husband were ordained and installed together as joint pastors in a pulpit in South Dakota in 1889, the ceremony being the first of that kind in history.[1][2] Bagley sang, played the piano, painted, and was interested in temperance, equal suffrage, and other public movements.[3]