John Erlenborn (February 8, 1927 - October 30, 2005) was a lawyer and a former Republican member of the U.S. Congressional Delegations from Illinois, representing the 14th (then after 1980s redistricting the 13th) district. He represented his district for twenty years, from January 1965 to January 1985, a period which began with the 89th U.S. Congress. He retired after serving in the 98th U.S. Congress.
He subsequently became an adjunct faculty member of the Georgetown University Law Center, and served as a board member for the Legal Services Corporation from 1989 to 2001. He died on October 30, 2005, at age 78, after suffering from Lewy body disease.