The 1973 Western Illinois Leathernecks football team represented Western Illinois University as an independent during the 1973 NCAA Division II football season. They were led by fifth-year head coach Darrell Mudra and played their home games at Hanson Field. The Leathernecks finished the season with a 7–4 record. The team received a bid to the inaugural NCAA Division II Football Championship, where they lost to Louisiana Tech in the quarterfinal.