Jerzy Marian Grotowski was a Polish theatre director and theorist whose innovative approaches to acting, training and theatrical production have significantly influenced theatre today. He is considered one of the most influential theatre practitioners of the 20th century as well as one of the founders of experimental theatre.

Experimental theatre, inspired largely by Wagner's concept of Gesamtkunstwerk, began in Western theatre in the late 19th century with Alfred Jarry and his Ubu plays as a rejection of both the age in particular and, in general, the dominant ways of writing and producing plays. The term has shifted over time as the mainstream theatre world has adopted many forms that were once considered radical.