John Linebaugh Knuppel (August 5, 1923 – November 15, 1986) was an American politician and Democratic member of the Illinois Senate from 1971 until 1981.
During World War II, he served overseas in the United States Marine Corps.
The 48th district included all or parts of Adams, Brown, Cass, Fulton, Mason, Peoria, and Schuyler counties in West-Central Illinois.
That same year, Mary Lou Kent, a Republican member of the Illinois House, defeated Democratic candidate George Lewis, a delegate to the 1970 Illinois Constitutional Convention, for Knuppel's state senate seat.
[9][10][11] In 1982, Knuppel ran for Congress in Illinois's 20th congressional district losing the Democratic primary to Dick Durbin who would go on to defeat Republican incumbent Paul Findley.