Heiner Müller (; January 9, 1929 – December 30, 1995) was a German (formerly East German) dramatist, poet, writer, essayist and theatre director. Described as "the theatre's greatest living poet" since Samuel Beckett, Müller is arguably the most important German dramatist of the 20th century after Bertolt Brecht. His "enigmatic, fragmentary pieces" are a significant contribution to postmodern drama and postdramatic theatre.