The Croatian mezzo-soprano with Italian roots studied at the Giuseppe Tartini Conservatory in Trieste, at the Royal Academy of Music in London and at the Staatliche Hochschule für Musik und Darstellende Kunst in Stuttgart with Dunja Vejzović. She continues to be coached by Brigitte Fassbaender.
After a year in the opera studio of the Stuttgart State Opera, Diana Haller became the youngest member of the ensemble in the 2010/11 season and has since sung roles such as ‚Cherubino’/“Le nozze di Figar“, ‚Ruggiero’/“Alcina“, ‚Orlofsky’/“Die Fledermaus“, ‚Rosina’/“Il barbiere di Siviglia“, ‚Angelina’/“La Cenerentola“ and ‚Dorabella’/“Così fan tutte“.
Guest engagements have taken her to the London Handel Festival in the title role in Hasse’s „Siroe, re di Persia“, as ‚Alberto‘ in Giuseppe Balducci’s „Il noce di Benevento“ to the Rossini Festival in Bad Wildbad (where she received the prestigious International Belcanto Prize), and as ‚Ruggiero‘ to the Cologne Opera and the Dresden Semperoper.
In 2014 she sang ‚Rosina‘ at the National Theatre Zagreb and was a guest cover for ‚Angelina‘ and ‚Rosina‘ at the Metropolitan Opera New York. At the Salzburg Festival she appeared in Verdi’s „Il Trovatore“ as ‚Ines‘ alongside Anna Netrebko and Placido Domingo.
In 2015 she appeared again as ‚Ines‘ at the Salzburg Festival, took the female title roles in Purcell’s „Dido and Aeneas“ at the Osor Festival, in Rossini’s Cenerentola at the Gärtnerplatztheater in Munich, and gave a song recital in Vienna.
In 2016 she sang the title role in Handel’s opera „Giulio Cesare in Egitto“ in Croatia and made her debut as ‚Enrichetta di Francia‘ in Bellini’s „I Puritani“ at the Zurich Opera House and the Stuttgart State Opera.
In 2017 she sang the title role in the new production of Handel’s „Ariodante“ at the Stuttgart State Opera, the title role in Handel’s „Giulio Cesare“ in Ljubljana (Slovenia), ‚Rosina‘ in Split (Croatia) and ‚Hansel‘ in the new production of Kirill Serebrennikov’s „Hansel and Gretel“.
In 2018, she made her debut at La Scala in Milan in the new production of Zandonai’s „Francesca da Rimini“ as ‚Altichiara‘ and ‚Adalgisa‘ in Bellini’s „Norma“ in Rijeka.
In the 2018/19 season she was heard as the ‚Composer‘ in Richard Strauss‘ „Ariadne auf Naxos“ at the Stuttgart State Opera and the Philharmonie Köln, as ‚Adalgisa‘ at the Rijeka Opera and the Stuttgart State Opera, as well as ‚Rosina‘ at the Semperoper Dresden. At the Maggio Fiorentino she sang Mahler’s “8th Symphony” under Fabio Luisi, as well as the same symphony at the Bregenz Festival under the baton of Kirill Petrenko and made her debut as ‚Tancredi‘ in Rossini’s opera of the same name (Rossini Festival Bad Wildbad).
In the 2019/20 season she made her debut at the Schubertiade Hohenems, sang ‚Adalgisa‘ in a new production at the Staatsoper Hamburg and ‚Cherubino‘ in a new production at the Staatsoper Stuttgart.
In the 2020/21 season she sang ‚Ruggiero‘ in Handel’s „Alcina“ at the Opéra de Strasbourg. She also sang ‘Giulio Cesare’ in Handel’s opera of the same name at the Savonlinna Opera Festival and at the Rijeka Opera in Croatia, where she also sang Verdi’s “Requiem”. The artist celebrated particulary successes with the two Strauss roles ‘Octavian’ in „Der Rosenkavalier“ and as the ‘composer’ in “Ariadne auf Naxos”, which she sang in Stuttgart but also in concert performances at the Frankfurt Opera (Thomas Guggeis). She made her debut at the Theater an der Wien as ‘Pippo’ in the new production “La gazza ladra”.
In the 2022/23 season she made her successful role debut as ‚Eboli’/“Don Carlo“ and celebrated her return to the Bad Wildbad Festival as ‚Leodato’/“Gli arabi nelle Gallie“.
The 2023/24 season includes a European tour with a Mendelssohn programme conducted by Jordi Savall, her role debut as ‚Giovanna Seymour‘ in a new production of „Anna Bolena“ in Rijeka, where the artist will also direct. This will be followed, among others, by ‚Eboli‘ this time in French, and her role debut as ‚Fricka‘ in „Das Rheingold“.
As a concert singer, she has toured in Mozart’s Great Mass in C minor and Mozart’s Requiem under Philippe Herreweghe, among others, and sang Schumann’s Requiem and Bach cantatas under Diego Fasolis. Other stops have included. Mahler’s Lied von der Erde at the Heidelberger Frühling and at the Stuttgart State Opera, Rossini’s Stabat Mater (WDR Symphony Orchestra) and Dvořak’s Requiem at the Cologne Philharmonie, an opera gala tour with the NDR Symphony Orchestra, Rossini’s Petite Messe Solennelle at the Amsterdam Concertgebouw, Handel’s Dixit Dominus with the Radio Orchestra in Zagreb, a Rossini gala with the Zagreb Symphony Orchestra, Mahler’s and Bernstein’s works with the Ulm Symphony Orchestra. In 2017 she performed Mozart’s Great Mass in C minor with the MDR Symphony Orchestra in Leipzig, Magdeburg and Erfurt, and in Ludwigsburg with the Karlshöhe Kantorei. She sang a bel canto evening in Fellbach with the Württembergische Philharmonie Reutlingen; she also performed Mendelssohn’s Walpurgisnacht in Schwäbisch Gmünd and in Wismar, in a gala evening with the orchestra of the Komische Oper Berlin. She sang recitals for the Hugo Wolf Academy, the Stuttgart Opera, the Eppan Lied Festival, in Mexico, at the National Theatre in Rijeka, in Vienna, Zagreb, etc.
Her discography includes works by Handel and Bach (Chor des Bayerischen Rundfunks /Concerto Köln), a solo album of Schumann and Wolf Lieder, and “Faust” by Gounod (Siebel) for Universal Music, released in 2018.
In 2012 she was awarded first prize at the 8th International Competition for Lied Art of the Hugo Wolf Academy in Stuttgart. In 2013 Diana Haller was voted Young Singer of the Year in the critics‘ poll of Opernwelt magazine. This was followed in the same year by the award for Young Musician of the Year 2013 by the Zagreb Symphony Orchestra and the Ivo Vuljevic Award for Outstanding Musical Achievement by Jeunesses Musicales. She is also an honorary member of the Croatian National Theatre Rijeka ensemble. In 2019 she received the Milka Trnina award for outstanding artistic achievement. In 2020 she won the 5th Manhattan International Competition and was awarded the Inge Borkh Prize.