The Viennese baritone Clemens Unterreiner has been a soloist at the Vienna State Opera since 2005, where he has already become a crowd pleaser in more than 21 premieres, over 900 performances in over 85 different roles. His operatic repertoire ranges all the way from classical to contemporary composers and includes all major baritone roles like Telramund, Escamillo, Wolfram, Geisterbote, Albert, Marcello, Faninal, Donner, Don Giovanni, Papageno, Gunther, Valentin and many more. He also performs in oratorios, song recitals and often takes the stage in operetta concerts. He is currently collaborating with the greatest conductors, directors and singers and will sing numerous first baritone roles in the new season of the Vienna State Opera.


Born and raised in Vienna Clemens Unterreiner also spent his childhood in Graz and Budapest. After he completed his school at the Academic High School he commenced studying law at the University of Vienna. During his studies, he began to train his voice and to deepen his knowledge in music theory and musicology. Since 1998 he started singing lessons among others with Prof. KS Hilde Rössel-Majdan, Prof. KS. Gottfried Hornik, Prof. Helena Lazarska and KS. Wicus Slabbert (KS = singer of outstanding merit), He participated in master classes with Prof. KS. Bernd Weikl, KS. Artur Korn and Prof. KS. Gottfried Hornik. During the year 2000 he was awarded a Bayreuth Festival Scholarship and in 2002 he was a semifinalist at the International Belvedere Singing Competition in Vienna. His extensive repertory includes lyric italian, german and french chivalrous and heroic baritone parts, operetta as well as a wide range of art song repertory including Schubert, Schumann, Strauss, Brahms, Wolf and many more, but also contemporary works of various composers.


He started his carreer at the annual Vienna Festival (Wiener Festwochen) and performed in concert tours in Bulgaria, Syria, Italy, Spain and Germany. He performed at the Grand Hall of the Wiener Musikverein, at the Vienna Concert House (Wiener Konzerthaus), Palao de la Musica Barcelona and other international concert halls. He sang concert performances of "La Traviata" - Germont, "Fidelio" - Pizarro and "Tosca" - Scarpia and in October 2002 he made his opera debut at the State Theatre in Linz for the European première of "The Voyage" by Philip Glass. During the summer of 2003 he sang Count Baccellone in "La Contessina".
Further engagements took him 2004 at the Vienna State Opera where he performed in the première of Massenet’s "Werther". He sang Sharpless in "Madama Butterfly" in Chur, Straßburg and Großes Festspielhaus Salzburg which was awarded the Prize of the Music Theatre 2004 season. Since 2005 he sang the title role in Don Giovanni, Bartolo in Paisiello's "Barber of Seville", Schlemihl and Crespél in "The Tales of Hoffmann", Don Parmenione in Rossini´s "L´occasione fa il ladro", Don Fernando - Minister in "Fidelio", Sulpice in the premiere of "La fille du régiment and celebrated with great success his Guglielmo in "Cosi fan tutte" and Papageno. He debuted with great success Consul Sharpless (Italian original version) at the Vienna Volksoper and was listening to since then there as a guest soloist in Carmen, Magic Flute, Rusalka and The Bat. In 2010 he celebrated as Donner a successful debut in "Rheingold" at the Wagner - Festival Budapest and continued 2011 with Consul Sharpless at the Royal Opera House Kopenhagen. During the next seasons he stretched his large repertoire with first bariton roles at the Vienna State Opera like Sharpless (Madama Butterfly), Gunther (Götterdämmerung), Donner (Rheingold) and Harlekin (Ariadne on Naxos), Faninal (The Knight of the Rose), Don Fernando (Fidelio) and Herrufer (Lohengrin). In 2012 he had his debut at the Opera de Nice and celebrated his first Salzburg Fetsival. 2013 he sings Sprecher in Mozart´s Magic flute, Don Fernando, The Highpriest in Alceste, Faninal at the Vienna State Opera, Papageno in Opéra de Nice and will celebrate his role debut as Wolfram in Wagner´s Tannhäuser at the Richard Wagner Festival. He also opened the new operahouse in Linz as Faninal in the gala performance of "The Knight of the Rose". In 2014 among other roles he sang Dr. Falke (The Bat), makehis debut as Musiklehrer (Ariadne auf Naxos), his debut as Telramund in Lohengrin, a recital concert in the Wiener Musikverein and his debut at the Carnegie Hall in New York. 2015 he sang along with many other roles in the New Years Bat at the Vienna State Opera, Faninal at the easter-festival Baden-Baden and at the State Opera Tokyo, the Brahms Requiem at the Wiener Musikverein and „Lieder eines fahrenden Gesellen“ by Gustav Mahler.


Clemens Unterreiner made his debut in Arabella at the Semperoper in Dresden with Christian Thielemann and rescued the premiere of Hansel and Gretel shortly afterwards as the father - Peter Besenbinder at the Vienna State Opera again under the direction of Christian Thielemann. In 2016, he sang the New Year's Eve and New Year's Bat at the State Opera and made his debut at the premiere in the 3 sisters - tri sestri of Peter Eötvös. He also sang Albert in Werther at the Royal Opera House Muscat and sang at the Staatsoper, among others, in Tosca, La Bohéme, Manon, La fanciulla del west and Alceste. For his 10th anniversary at the Opera Klosterneuburg he triumphed as Tonio in Bajazzo and afterwards celebrated at the Vienna Staatsoper as the first Austrian after 34 years a great success as Escamillo in Carmen. In the autumn he sang several song recitals and concerts in the Ehrbarsaal, MÜPA Budapest, Concert Hall Vienna and the Wiener Musikverein and celebrated his debut at the Royal Opera House Muscat as Telramund in Wagner's Lohengrin. He is looking forward to the "Zauberflöte" and „The Bat“ on New Year's Eve at the Staatsoper. In 2017 there will be further premieres at the Vienna State Opera, St. Margarethen Opera Festival, Steinbach Philharmonic Weeks Attersee, Mahler Songs at the Carinthian Summer Festival, following a resumption of the Rosenkavalier at the Vienna State Opera and then at the State Opera Tokyo. He made his debut as Valentin in Faust at the Opera Festival Savonlinna in Finland. At the renowned summer festival “operklosterneuburg” he celebrated his celebrated role debut in all four evil roles of the villains in “The Tales of Hoffmann”. In 2020 he sang many first baritone roles such as Sharpless (Madama Butterfly), Dr. Falke (The Bat), Minister (Fidelio), Paolo (Simon Boccanegra), First Priest (Samson et Dalila) etc. as well as other role debuts, recitals and concerts in Vienna and abroad. Clemens will fortunately stay solist and ensemble member oft he Vienna State Opera in Bogdan Roščić´s new management from 2020/2021 singing his well known and popular roles and also many new baritone debuts, thus remaining loyal to his company, fans and his beloved Viennese audience.