Phaedra is a 'concert opera' in two acts by Hans Werner Henze. Its first performance was given at the Berlin State Opera on 6 September 2007. The work is a co-commission and co-production with the Berliner Festspiele, Théâtre de la Monnaie, Brussels, Alte Oper Frankfurt and the Vienna Festival.

Hans Werner Henze was a German composer. His large oeuvre is extremely varied in style, having been influenced by serialism, atonality, Stravinsky, Italian music, Arabic music and jazz, as well as traditional schools of German composition. In particular, his stage works reflect "his consistent cultivation of music for the theatre throughout his life".