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

Larry Simon Gelbart was an American television writer, playwright, screenwriter, director and author, most famous as a creator and producer of the television series M*A*S*H, and as co-writer of the Broadway musicals A Funny Thing Happened on the Way to the Forum and City of Angels.

Joel Jay Kupperman was an American professor of philosophy at the University of Connecticut and author of Six Myths about the Good Life, a popular philosophical volume centering on those values most worth engaging in human life. He was best known to the general public as a young math expert on the radio and television show Quiz Kids. He astounded audiences with his ability to do complex mathematics rapidly and seemingly "in his head." He also had strong general knowledge, and was often the winner of the weekly competitions featured on the show. The 1944 film Chip Off the Old Block, starring Donald O'Connor, Peggy Ryan and Ann Blyth, featured Kupperman as the "Quiz Kid", representative of the group.

Keith Szarabajka is an American actor and voice actor known as Mickey Kostmayer in The Equalizer, Daniel Holtz in Angel, Harlan Williams in Golden Years, Trigon in Teen Titans, Master of Whispers in Guild Wars and Gerard Stephens in The Dark Knight. He is also known for portraying Detective Herschel Biggs in the 2011 crime thriller video game L.A. Noire, which included his likeness.

Jonathan Luther Jackson is an American politician, business professor, entrepreneur and social justice advocate. He is the national spokesman for the Rainbow/PUSH Coalition and a partner in a Chicago-based beer distributorship, River North Sales and Service, LLC. He is the Democratic nominee for the United States House of Representatives for Illinois's 1st congressional district in 2022.

Frank Lloyd Wright Jr., commonly known as Lloyd Wright, was an American architect, active primarily in Los Angeles and Southern California. He was a landscape architect for various Los Angeles projects (1922–24), provided the shells for the Hollywood Bowl (1926–28), and produced the Swedenborg Memorial Chapel at Rancho Palos Verdes, California (1946–71). His name is frequently confused with that of his more famous father, Frank Lloyd Wright.

William Linn Westermann was an American historian and papyrologist who served as the president of the American Historical Association in 1944. He was regarded as an expert on the economy of the ancient world.

Sam Bard Treiman was an American theoretical physicist who produced research in the fields of cosmic rays, quantum physics, plasma physics, and gravity physics. He made contributions to the understanding of the weak interaction and he and his students are credited with developing the so-called standard model of elementary particle physics. He was a Higgins professor of physics at Princeton University, a member of the National Academy of Sciences and member of the JASON Defense Advisory Group. He was a student of Enrico Fermi and John Alexander Simpson Jr. Treiman published articles on quantum mechanics, plasmas, gravity theory, condensed matter and the history of physics.

Sam Bobrick was an American author, playwright, television writer, and lyricist.

Cory Hardrict is an American actor. He has appeared in film and television since the late 1990s. He was an executive producer for the 2012 film The Watch.

Diane Hegarty is co-founder of the Church of Satan, which she co-founded with her longtime partner Anton LaVey.