Sieglinde Feldhofer was born in Styria (Austria) where she studied at the University for Music And Performing Arts Graz. She attended master classes with Gary Magby, Romualdo Savastano and Brigitte Fassbaender, and received several awards during her studies, including the Lions Panthera Encouragement Award. She was a finalist in the International Hans Gabor Belvedere Competition (operetta division) in 2009, and in 2013 she was awarded the Austrian music theatre prize „Goldener Schikaneder“ for best Young Artist.
In the 2008-09 season Sieglinde Feldhofer joined the ensemble of Oper Graz, where she performed roles such as Papagena (Die Zauberflöte), Smeraldine (Die Liebe zu den drei Orangen), Eliza Doolittle (My Fair Lady), Maria Rainer (The Sound of Music), Adele (Die Fledermaus), Schlafittchen (Das Traumfresserchen), Komtesse Stasi (Die Csárdásfürstin), Barbarina (Le nozze di Figaro), Christel (Der Vogelhändler), Zerlina (Don Giovanni), Franzi Steingruber (Ein Walzertraum), Gigi (Gigi), Sora (Gasparone), Gretel (Hänsel und Gretel), Ottilie (Im weißen Rössl), Julie Jordan (Carousel), Valencienne (Die lustige Witwe), Hortense (Der Opernball), the Girl (Tell me on A Sunday), and many more.
In addition Sieglinde Feldhofer has made guest appearances at the Seefestspiele Mörbisch as Mascha in Der Zarewitsch (2010), at the Volksoper Wien as Franziska Cagliari in Wiener Blut (2011), at the Salzburger Landestheater (2012), the Seefestspiele Mörbisch (2012) and the Vereinigte Bühnen Bozen (2014) as Adele, at the Lehár Festival Bad Ischl in the leading role of Margit in Lehár’s Wo die Lerche singt (2013), and at the Theater Baden as Dolly Girot in Lehár’s operetta rarity Frasquita (2016). In 2016-17 she returned to the Lehár Festival Bad Ischl in two roles: as Kondja Gül in Leo Fall’s Die Rose von Stambul as well as Miss Phoebe in Lehár’s Die Juxheirat. She also made her debut as Maria in West Side Story at the Oper Graz and returned to the Seefestspielen Mörbisch as Christel in Der Vogelhändler and to the Theater Baden as Sonja in Der Zarewitsch.
In 2017-18 she sings Musetta and Susanna (Le Nozze di Figaro) at the Oper Graz, debuts at the Opera House of National Grand Theatre in Beijing as Valencienne in Die lustige Witwe, and makes returns to the Volksoper Wien as Hortense (Helene) in Der Opernball and the Theater Baden as Marzelline in Fidelio.