List of Famous people born in Illinois, United States of America

Timothy Lee Walberg is an American politician. A member of the Republican Party, he has served as the U.S. Representative for Michigan's 7th congressional district since 2011. He previously represented the district from 2007 to 2009.

Giorgio Tozzi was an American operatic bass. He was a mainstay for many years with the Metropolitan Opera, and sang principal bass roles in nearly every major opera house worldwide.

John Adam Belushi was an American actor, comedian and singer, and one of the seven original cast members of the NBC sketch comedy show Saturday Night Live (SNL). Throughout his career, Belushi had a close personal and artistic partnership with his fellow SNL star Dan Aykroyd, whom he met while they were both working at Chicago's The Second City comedy club.

John Norman is the pen name of John Frederick Lange Jr., who is the author of the Gor series of science fantasy novels, and a professor of philosophy.

Vincent Dole was an American doctor, who, along with his wife, Marie Nyswander, developed the use of methadone to treat heroin addiction. Dole and Nyswander, in establishing methadone maintenance treatment (MMT), improved treatment options in addiction medicine which for a century had been based on the conventional view that narcotic addiction was the result of an intractable moral defect. His work resulted in the partial re-legalization of opioid maintenance in the United States. For this contribution he was a recipient of the 1988 Albert Lasker Award for Clinical Medical Research.

Susan Hockfield is an American neuroscientist who served as the sixteenth president of the Massachusetts Institute of Technology from December 2004 through June 2012. Hockfield succeeded Charles M. Vest and was succeeded by L. Rafael Reif, who had served in her administration as Provost. Hockfield was the first biologist and the first woman to serve as the Institute's president. Hockfield currently serves as a Professor of Neuroscience in MIT's Department of Brain and Cognitive Sciences, a Joint Professor of Work and Organization Studies in MIT’s Sloan School of Management, and a member of the Koch Institute for Integrative Cancer Research. She is also a director of Break Through Cancer, Cajal Neuroscience, Fidelity Non-Profit Management Foundation, Lasker Foundation, Mass General Brigham, Pfizer, Repertoire Immune Medicines, and the Whitehead Institute for Biomedical Research; a lifetime member of the MIT Corporation; and a board member of the Belfer Center at the Harvard Kennedy School of Government. Before returning to MIT following her presidency, Hockfield held the Marie Curie Visiting Professorship at Harvard University's John F. Kennedy School of Government.

Gary K. Wolf is an American author. He is best known as the author of Who Censored Roger Rabbit? (1981), which was adapted into the hit feature-length film Who Framed Roger Rabbit (1988).

Robert William Holley was an American biochemist. He shared the Nobel Prize in Physiology or Medicine in 1968 for describing the structure of alanine transfer RNA, linking DNA and protein synthesis.

Robert Ghormley Parr was an American theoretical chemist who was a Professor of Chemistry at the University of North Carolina at Chapel Hill.