Liane Synek (17 September 1922 – 6 September 1982) was an Austrian operatic soprano. She made a career based in Germany, at the Hessisches Staatstheater Wiesbaden, the Staatsoper Berlin and the Cologne Opera, and appeared at international major opera houses and festivals, such as the Bayreuth Festival. She appeared mostly in dramatic roles such as Beethoven's Fidelio, and Wagner's Sieglinde, Brünnhilde and Isolde. She also performed in contemporary operas, creating the role of Countess de la Roche in Zimmermann's Die Soldaten in Cologne in 1965, conducted by Michael Gielen.