Theatre in Pittsburgh has existed professionally since the early 1800s and has continued to expand, having emerged as an important cultural force in the city over the past several decades.
The heritage of theatre in Pittsburgh stretches back to at least 1765, when it was recorded that "balls, plays, concerts, and comedies" were being performed at the British military installation at Fort Pitt. Subsequently, amateur "thespian societies" emerged, including the Thespian Society that was organized by students of the Pittsburgh Academy in 1810, the forerunner of the University of Pittsburgh, in order to stage popular comedies and musical entertainment. These students included Henry Marie Brackenridge, the son of university founder Hugh Henry Brackenridge; Morgan Neville, the son of Presley Neville; and future U.S. Congressman and Senator William Wilkins. This club was frequently mentioned by travelers commenting on the early culture of Pittsburgh, however it was disbanded by university faculty in 1833 because, according to Agnes Starrett's 1937 history of the university, "instead of Shakespeare, the members had begun to produce vulgar modern comedies". Throughout the 1800s, Pittsburgh was home to various , beginning with the Theatre on Third Street, Pittsburgh's first free-standing playhouse, in 1813. These companies were composed of eight to ten local actors, a stage manager and prompter, a stage carpenter, a properties master, and occasionally an orchestra leader; the local actors would perform with touring "stars" such as William Macready, Edwin Forrest, Junius and Edwin Booth, Charles Kean, Charlotte Cushman, James Hackett, and Edwin Adams. An important milestone in the creation of indigenous Pittsburgh theatre occurred when William Henderson took over the lease of the Old Drury in 1859 and produced plays by Pittsburgh playwrights in the theatre's season. Other theatres followed Henderson's lead, including the Pittsburgh Opera House, which held the first productions of nationally regarded playwright Bartley Campbell.