Till Fellner was born in Vienna and studied at the Konservatorium der Stadt Wien with Helene Sedo-Stadler, and subsequently with Alfred Brendel, Meira Farkas, Oleg Maisenberg and Claus-Christian Schuster. He won first prize in the Clara Haskil International Piano Competition in Vevey, Switzerland in 1993, and was awarded the Mozartinterpretationspreis of the Mozartgemeinde Wien in 1998.
Fellner has received critical acclaim for his performances of the masterworks of the baroque, classical, and romantic periods, particularly compositions by J.S. Bach, Mozart, Beethoven, Schubert, and Liszt. He performs musical rarities such as the piano sonata of Julius Reubke, which was composed in Weimar under the aegis of Liszt. Fellner also performs music of the Second Viennese School of Arnold Schoenberg, Alban Berg and Anton Webern, as well as the contemporary classical music of Heinz Holliger, György Kurtág, Thomas Larcher, and Harrison Birtwistle, including some premieres.
In 2008–2010, Fellner performed Beethoven's 32 piano sonatas in a seven-recital series in Vienna, Paris, London, New York City, and Tokyo. He also performed and recorded Beethoven's Piano Concertos Nos. 4 and 5 with the Montreal Symphony under the baton of Kent Nagano. In 2009, Fellner was featured in the award-winning German-Austrian documentary Pianomania, about a Steinway & Sons piano tuner, which was directed by Lilian Franck and Robert Cibis. The film was met with a positive review by The New York Times.
- Schubert: 4 Impromptus, D 935, Op. posth. 142; Arnold Schoenberg: Suite, Op. 25; Beethoven: Sonata No. 23 in F minor, Op. 57 'Appassionata'. EMI Austria, 567 7 54497 2 (1992)
- Mozart: Piano Concerto No. 22 in E flat major, K 482 (Orchestre de Chambre de Lausanne/Uri Segal); Mozart: Rondo in A minor, K 511; Beethoven: Sonata No. 5 in C minor, Op. 10 No. 1. Claves, CD 50-9328 (1994)
- Beethoven: Piano Concerto No. 2 in B flat major, Op. 19; Beethoven: Piano Concerto No. 3 in C minor, Op. 37 (The Academy of St. Martin in the Fields/Sir Neville Marriner). Erato, 4509-98539-2 (1995)
- Schumann: Kreisleriana, Op. 16; Julius Reubke: Sonata in B-flat minor. Erato, 0630-12710-2 (1996)
- Schubert: Sonata in A minor, D 784, Op. posth. 143; Schubert: 6 Moments musicaux, D 780, Op. 94; Schubert: 12 Grazer Walzer, D 924, Op. 91. Erato, 0630-17869-2 (1997)
- Mozart: Piano Concerto No. 19 in F major, K 459; Mozart: Piano Concerto No. 25 in C major, K 503 (Camerata Academica Salzburg/Alexander Janiczek). Erato, 3984-23299-2 (1998)
- Beethoven: The Complete Works for Cello and Piano (Heinrich Schiff, cello). Philips, 462 601-2 (2000)
- J. S. Bach: The Well-Tempered Clavier, Book I, BWV 846-869. ECM New Series, 1853/54 (2004)
- J. S. Bach: Inventions & Sinfonias, French Suite No. V, ECM New Series, 2043 (2009)
- Beethoven: Piano Concerto No. 4 in G major, Op. 58; Piano Concerto No. 5 in E-flat major, Op. 73 (Orchestre symphonique de Montréal/Kent Nagano). ECM New Series 2114
- Thomas Larcher: Böse Zellen for piano and orchestra (2006, rev. 2007) I.-IV.; Still for viola and chamber orchestra (2002, rev. 2004) Madhares (String Quartet no. 3) (2006/7) (Münchener Kammerorchester/Kim Kashkashian/Dennis Russell Davies) ECM New Series 2111
- Dargis, Manohla (3 November 2011). "'Pianomania' by Lilian Franck and Robert Cibis - Review". The New York Times.
- The Well-Tempered, Soft-Spoken Clavier - Anthony Tommasini, New York Times
- Sounds Both Eclectic and Electric - Anthony Tommasini, New York Times