Frankie Albert, quarterback and head coach for San Francisco 49ers, College Football Hall of Famer.
Eddie Albert, Oscar-nominated actor, Green Acres, Switch, Oklahoma!, Roman Holiday, The Heartbreak Kid, The Longest Yard.
Stan Albeck, basketball head coach, Bradley, Cleveland Cavaliers, San Antonio Spurs, Chicago Bulls.
Joe Aiello, organized crime figure (born in Sicily).
Mark Aguirre, forward for DePaul, NBA's Dallas Mavericks and Detroit Pistons top pick of 1981 NBA draft.
Benjamin Agosto, ice dancer, 2006 Turin Olympics silver medalist.
Milton Ager, composer, " Ain't She Sweet", " Happy Days Are Here Again".
Lou Agase, football player for Illinois, coach of CFL's Toronto Argonauts.
Alex Agase, football player for Cleveland Browns head coach of Northwestern, Purdue.
John Agar, actor, Sands of Iwo Jima, She Wore a Yellow Ribbon, husband of Shirley Temple.
Scott Adsit, actor, writer, improvisational comedian, 30 Rock, Big Hero 6.
Max Adler, founder of Adler Planetarium.
David Adler, architect (born in Wisconsin).
Dankmar Adler, architect (born in Germany).
Victor Adeyanju, NFL defensive end 2006–10.
Paul Adelstein, actor, Prison Break, Private Practice.
George Ade, author and cartoonist (born in Indiana).
Jane Addams, social worker, teacher, Nobel Peace Prize recipient.
Katrina Adams (1968– living), president of United States Tennis Association.
John Hicks Adams (1820–78), gunslinger, Wild West lawman.
Described as "a native of Chicago", he found fame and lived most of his life in New York. Adams (1881–1960), writer, member of Algonquin Round Table. Born and lived first thirty years in Illinois.
Berle Adams (1917–2009), founder of Mercury Records.
Lived in Illinois for a number of years after emigrating to the United States from Lithuania, getting a college degree and entering Chicago politics.
Valdas Adamkus (1926– living), president of Lithuania 1998–2009.
Acks was born, attended high school and college in Illinois. Came to Illinois at age of five and resided until her death. Born and lived entire life in Chicago metropolitan area.
Tony Accardo (1906–1992), organized crime figure.
Lived most of her life in Chicago and known for her association with the city.