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

Cynthia Plaster Caster is an American artist and self-described "recovering groupie" who gained fame for creating plaster casts of famous persons' erect penises.

Hillary Wolf Saba is an American former child actress and judoka.

Kazimierz Andrew "Casey" Siemaszko is an American actor. Among supporting roles in films such as Back to the Future (1985) and Stand by Me (1986), he also is known for his starring roles in films such as Three O'Clock High (1987) and Breaking In (1989), along with numerous small roles in film and television, and Pat Fraker in NYPD Blue, and as Jack Ruby in Killing Kennedy (2013).

Peter Jacobson is an American actor. He is perhaps best known for his portrayal of Dr. Chris Taub on the Fox medical drama series House. He also starred on the USA Network science fiction drama Colony as former Proxy Snyder.

Anna Halprin helped pioneer the experimental art form known as postmodern dance and referred to herself as a breaker of the rules of modern dance. Halprin, along with her contemporaries such as Merce Cunningham and John Cage, and her students Trisha Brown, Simone Forti, and Yvonne Rainer, redefined dance in postwar America. In the 1950s, she established the San Francisco Dancers' Workshop to give artists like her a place to practice their art. Being able to freely explore the capabilities of her own body, she created a systematic way of moving using kinesthetic awareness. Many of her works since have been based on scores, including Planetary Dance, 1987, and Myths in the 1960s which gave a score to the audience, making them performers as well.

Kevin James O'Connor is an American actor.

Tessa Violet Williams, previously known as Meekakitty, is an American singer-songwriter, video blogger, actress, music video director, and former model. Originally a video blogger, over the years Tessa Violet's online content became devoted to her musical career with Violet having released two studio albums, Maybe Trapped Mostly Troubled in 2014 and Bad Ideas in 2019.

Brian Oldfield was an American athlete and personality of the 1970s and early 1980s. A standout shot putter, Oldfield was credited with making the rotational technique popular. With his "Oldfield spin," he set the indoor and outdoor world records in the sport many times. However, due to his status as a professional athlete, and due to the lack of official control of his achievements by athletic authorities as well as later steroid-related investigations, his records were never officially recognized.

Leicester Clarence Hemingway was an American writer. He was the younger brother of writer Ernest Hemingway and wrote six books, including a first novel entitled The Sound of the Trumpet (1953), based on Leicester's experiences in France and Germany during World War II.

James Marshall Thompson was an American film and television actor.