Margaret Florence Greig, known by her stage name Florence St. John, was an English singer and actress of the late Victorian and Edwardian eras famous for her roles in operetta, musical burlesque, music hall, opera and, later, comic plays.

Madame Favart is an opéra comique, or operetta, in three acts by Jacques Offenbach. The French libretto was written by Alfred Duru and Henri Chivot.