Aloys (born 14 May 1931) and Alfons (9 October 1932 – 5 May 2010) Kontarsky were German duo-pianist brothers who were associated with a number of important world premieres of contemporary works. They had an international reputation for performing modern music for two pianists, although they also performed the standard repertoire and they sometimes played separately. They were occasionally joined by their younger brother Bernhard in performances of pieces for three pianos.

The Kontarsky brothers were both born in Iserlohn. Aloys received early tuition from Franz Hanemann. He later studied at Cologne and Hamburg with Else Schmitz-Gohr, and with Eduard Erdmann in Hamburg.