The Chicago Theatre, originally known as the Balaban and Katz Chicago Theatre, is a landmark theater located on North State Street in the Loop area of Chicago, Illinois, United States. Built in 1921, the Chicago Theatre was the flagship for the Balaban and Katz (B&K) group of theaters run by A. J. Balaban, his brother Barney Balaban and partner Sam Katz. Along with the other B&K theaters, from 1925 to 1945 the Chicago Theatre was a dominant movie theater enterprise. Currently, Madison Square Garden, Inc. owns and operates the Chicago Theatre as a performing arts venue for stage plays, magic shows, comedy, speeches, sporting events and popular music concerts.

The building was added to the National Register of Historic Places on June 6, 1979, and was listed as a Chicago Landmark on January 28, 1983. The distinctive Chicago Theatre marquee, "an unofficial emblem of the city", appears frequently in film, television, artwork, and photography.