The Incorporated Stage Society, commonly known as the Stage Society, was an English theatre society with limited membership which mounted private Sunday performances of new and experimental plays, mainly at the Royal Court Theatre but also at other London West End venues. Founded in 1899 "to regenerate the Drama", it followed the Independent Theatre Society in this activity. Its plays particularly included the first performances of plays that had been banned for public performance by the Lord Chamberlain. George Bernard Shaw, Harley Granville Barker, St. John Hankin, Gilbert Murray and Clifford Bax were all involved with the company.