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

Robert Hamilton Austin is an American physicist and a professor of physics at Princeton University.

Leona Roberts was an American stage and film actress.

Marjorie Best was an American Hollywood costume designer known for her period designs.

Judy Grahn is an American poet and author.

David Herbert Caspe is an American film and television writer. As a writer-producer, he is best known for his work in television as creator of sitcoms such as ABC's Happy Endings, the Showtime comedy Black Monday, and the NBC sitcoms Kenan and Marry Me. Other work includes writing the 2012 film That's My Boy and co-creating the YouTube Premium series Champaign ILL.

Edwin Charles Krupp is an American astronomer, researcher, author, and popularizer of science. He is also known as Ed or E.C. He is an internationally recognized expert in the field of archaeoastronomy, the study of how ancient cultures viewed the sky and how those views affected their cultures. He has taught at the college level, as a planetarium lecturer, and in various documentary films. He has been the director of the Griffith Observatory in Los Angeles since first taking over the position in 1974 after the departure of the previous director, William J. Kaufmann III. His writings include science papers and journal articles, astronomy magazine articles, books on astronomy and archaeoastronomy for adults, and books explaining sky phenomena and astronomy to children.

Darin McKay LaHood is an American politician serving as the U.S. Representative for Illinois' 18th congressional district since 2015. A member of the Republican Party, he previously was the member of the Illinois Senate from the seven-county 37th legislative district (2011–2015). He was elected to Congress in a special election following the resignation of Aaron Schock.

Paul John Flory was an American chemist and Nobel laureate who was known for his work in the field of polymers, or macromolecules. He was a leading pioneer in understanding the behavior of polymers in solution, and won the Nobel Prize in Chemistry in 1974 "for his fundamental achievements, both theoretical and experimental, in the physical chemistry of macromolecules".

David Harold Blackwell was an American statistician and mathematician who made significant contributions to game theory, probability theory, information theory, and Bayesian statistics. He is one of the eponyms of the Rao–Blackwell theorem. He was the first African American inducted into the National Academy of Sciences, the first black tenured faculty member at UC Berkeley, and the seventh African American to receive a Ph.D. in Mathematics.

Marvin Camras was an electrical engineer and inventor who was widely influential in the field of magnetic recording.