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 Mozart Society of Vienna in 1998.
He has worked with Claudio Abbado, Vladimir Ashkenazy, Herbert Blomstedt, Semyon Bychkov, Christoph von Dohnányi, Christoph Eschenbach, Bernard Haitink, Nikolaus Harnoncourt, Manfred Honeck, Sir Charles Mackerras, Sir Neville Marriner, Kurt Masur, Kent Nagano, Jonathan Nott, Kirill Petrenko, and Hans Zender.
An active chamber musician, Fellner regularly collaborates with the Belcea Quartet, tenor Mark Padmore, violinist Lisa Batiashvili and cellist Adrian Brendel.
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.