Katharina Wagner (born in Bayreuth) is a German opera stage-director and co-director of the Bayreuth Festival. She is the daughter of Wolfgang Wagner, great-granddaughter of Richard Wagner, and great-great granddaughter of Hungarian composer Franz Liszt.

Wagner has staged Der fliegende Holländer in Würzburg and Lohengrin in Budapest. Her directorial début at the Bayreuth Festival, staging a production of Richard Wagner's Die Meistersinger von Nürnberg in July 2007, was booed at its premiere, but established a following which returned to watch the production evolve as Wagner made changes in each of the five years it was on view. Wagner also took a bow after every performance, with audiences split between bravas and boos.

On 1 September 2008, Katharina Wagner was named together with her half-sister Eva Wagner-Pasquier as the new director of the Bayreuth Festival by the Richard Wagner Foundation, succeeding their father Wolfgang. This followed an extended family dispute. They were chosen in preference to their cousin Nike Wagner and the Belgian opera director and administrator Gerard Mortier, who had placed a late joint bid for the directorship on 24 August.

In October 2010, Wagner planned to visit Israel in order to invite the Israel Chamber Orchestra to play a concert in July 2011 at the Bayreuth town hall, to end a post-1945 boycott of Wagner's music in Israel. Her visit was canceled after hostility from Holocaust survivors.

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