Kathryn M. "Kathy" Daynes (born 1946) is a professor of history at Brigham Young University (BYU) and a historian of Mormonism, specializing in Mormon polygamy. She was president of the Mormon History Association in 2008 and 2009. Daynes is married to Byron (Bill) Daynes, a professor of political science at BYU. They are the parents of three children. Daynes was appointed the director of the Center for Family History and Genealogy at BYU in 2007.