|Date of birth:January 13, 1910|
|Place of birth: Hillsboro, Illinois|
|Date of death: October 24, 1972(aged 62)|
|Place of death: Grand Rapids, Michigan|
|College: Franklin (IN)|
|No regular season or postseason appearances|
|* Detroit Lions ( 1937)|
|Career highlights and awards|
|Stats at pro-football-reference.com|
Ralph L. Isselhardt (January 13, 1910 – October 24, 1972) was an American football player who played one season in the National Football League with the Detroit Lions and Cleveland Rams. He played college football at Franklin College. He first enrolled at Hillsboro High School in Hillsboro, Illinois before transferring to Marion High School in Marion, Indiana.
Isselhardt played for the Franklin Grizzlies. He was inducted into the Franklin College Athletic Hall of Fame in 1975.
- "Detroit Lions All-Time Roster". detroitlions.com. Archived from the original on October 7, 2015. https://web.archive.org/web/20151007194514/http://www.detroitlions.com/team/history/all-time-roster.html. Retrieved October 7, 2015.
- "RALPH ISSELHARDT". profootballarchives.com. http://www.profootballarchives.com/isse00200.html. Retrieved October 7, 2015.
- "Athletic Hall of Fame". franklingrizzlies.com. Archived from the original on October 7, 2015. https://web.archive.org/web/20151007194525/http://www.franklingrizzlies.com/information/HOF. Retrieved October 7, 2015.
- "Ralph Isselhardt". pro-football-reference.com. Sports Reference LLC. https://www.pro-football-reference.com/players/I/IsseRa20.htm. Retrieved October 8, 2015.