| Mario De Pillis | |
| Birth Name: | Mario S. De Pillis |
| Birth Date: | 22 January 1926 |
| Birth Place: | Philadelphia, Pennsylvania, U.S. |
| Education: | University of Chicago Yale University (PhD) |
| Occupation: | Historian |
Mario S. De Pillis (January 22, 1926, in Philadelphia, Pennsylvania[1] – November 18, 2021) was an emeritus professor of American Religious history at the University of Massachusetts Amherst. De Pillis specialized in the history of such groups as the Latter-day Saints and Shakers. He was the second president of the Mormon History Association who was not a member of The Church of Jesus Christ of Latter-day Saints, any other Latter-day Saint movement church, or a former member of any such church.[2]
De Pillis had a bachelor's and master's degree from the University of Chicago and a Ph.D. from Yale University.
De Pillis and his wife, the former Freda M. Rustemeyer, were the parents of three sons. De Pillis was a Catholic.