The Chicago Opera Theater (COT) is an American opera company based in Chicago, Illinois. COT is a resident company at the Harris Theater for Music and Dance in Chicago's Millennium Park and is currently in residence at the newly renovated Studebaker Theater in the historic Fine Arts Building. In addition to productions of selected operas from the core opera repertoire, COT has an emphasis on American composers, Chicago premieres, and producing new contemporary operas for a 21st-century audience.