Epic theatre is a theatrical movement that arose in the early to mid-20th century from the theories and practice of a number of theatre practitioners who responded to the political climate of the time through the creation of new political dramas. Epic theatre is not meant to refer to the scale or the scope of the work, but rather to the form that it takes. Epic theatre emphasizes the audience's perspective and reaction to the piece through a variety of techniques that deliberately cause them to individually engage in a different way. The purpose of epic theatre is not to encourage an audience to suspend their disbelief, but rather to force them to see their world as it is.

Twentieth-century theatre describes a period of great change within the theatrical culture of the 20th century, mainly in Europe and North America. There was a widespread challenge to long-established rules surrounding theatrical representation; resulting in the development of many new forms of theatre, including modernism, expressionism, impressionism, political theatre and other forms of Experimental theatre, as well as the continuing development of already established theatrical forms like naturalism and realism.