The Park Square Theatre (1915-1921) of Boston, Massachusetts, was a theatre in Park Square owned by Archibald and Edgar Selwyn. It occupied the former Cort Theatre in a building designed by architect Clarence Blackall. In 1921 "Selwyn's Park Square Theatre [was] renamed the Selwyn. ... In renaming the theatre, the owners ... made it one of a chain of Selwyn theatres in the United States." In time the building "was replaced by a huge parking garage for automobiles."