Mario De Pillis

{{Short description|American historian (1926–2021)}}

{{infobox person

|name=Mario De Pillis

|birth_name=Mario S. De Pillis

|birth_date={{birth date|1926|1|22}}

|birth_place=Philadelphia, Pennsylvania, U.S.

|death_date={{death date and age|2021|11|18|1926|1|22}}

|education=University of Chicago
Yale University (PhD)

|occupation=Historian

}}

Mario S. De Pillis (January 22, 1926, in Philadelphia, Pennsylvania{{ cite web |title=Archives West: Mario S. De Pillis papers, 1957-2008 |url=http://archiveswest.orbiscascade.org/ark:/80444/xv27209/pdf |accessdate=18 March 2017}} – 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.{{cite web |title=Mario S. De Pillis Sr. 1926 - 2021 |url=https://www.legacy.com/us/obituaries/gazettenet/name/mario-pillis-obituary?id=31681412 |publisher=Daily Hampshire Gazette |access-date=3 December 2021}}

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.{{citation needed|date=April 2012}}