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

Delbert Ray Fulkerson was an American mathematician who co-developed the Ford–Fulkerson algorithm, one of the most well-known algorithms to solve the maximum flow problem in networks.

Warren Abraham Bechtel was the founder of the Bechtel Corporation, the largest construction company in the United States as of 2017.

Perry Gilbert Eddy Miller was an American intellectual historian and a co-founder of the field of American Studies. Miller specialized in the history of early America, and took an active role in a revisionist view of the colonial Puritan theocracy that was cultivated at Harvard University beginning in the 1920s. Heavy drinking led to his premature death at the age of fifty-eight. "Perry Miller was a great historian of Puritanism but the dark conflicts of the Puritan mind eroded his own mental stability."

Richard Henry Marx was an American jazz pianist and arranger. He also composed for film, television, and commercials.

Barbara Stuart was an American actress.

Kenneth Edward Olin is an American actor, television director and producer. He is known for his role as Michael Steadman in the ABC drama series Thirtysomething (1987-1991), for which he received Golden Globe Award for Best Actor – Television Series Drama nomination in 1990. Olin later began working as television director and producer; his producer credits include Alias (2001-2006), Brothers & Sisters (2006–2011), and This Is Us (2016-present). Olin is married to actress Patricia Wettig.

Beatrice Gray was an American actress and dancer best known for her appearances in a series of western films during the 1940s and 1950s.

Belding Hibbard Scribner was an American physician and a pioneer in kidney dialysis.

David Clennon is an American actor. He is known for his portrayal of Miles Drentell in the ABC series thirtysomething and Once and Again, as well as his role as Palmer in the John Carpenter film The Thing. He has been frequently cast in films directed by Hal Ashby, Costa-Gavras and Jordan Walker-Pearlman.

Frank M. Robinson was an American science fiction and techno-thriller writer.