Michal Rataj (born 1975) is a composer, performer and sound designer based in Prague, Czech Republic. He primarily composes electroacoustic music and instrumental music for chamber groups or orchestra. He has recently been active as a real-time performer of his own acousmatic music and he also presents sound performances alone or with various music partners in a wide range of genres ranging from sound art to contemporary jazz. He was received commissions from Swedish Radio, WDR, Czech Radio, Czech Television, Prague Philharmonia and Tonspur Vienna, among others. He has worked as a radio producer at the Czech Radio since 2000, where he has produced over 100 original works of radio art by artists from around the world. He has composed numerous film soundtracks and produced sound compositions for dozens of radio plays and radiophonic programs.

Rataj is associated professor of electroacoustic music at the Department of Composition, Academy of Performing Arts and at the NYU in Prague. He studied musicology (Charles University, Prague) and composition (Academy of Performing Arts, Prague) with prof. Ivan Kurz and prof. Milan Slavický. He also went to study in Egham (UK) and Berlin (D) and as a Fulbright Scholar he conducted research in Center For New Music And Audio Technologies at University of California, Berkeley, CA in the academic year 2007 – 2008. He has worked as a radio producer at the Czech Radio since 2000, where he has produced over 100 original radioart works with artists from around the world. He also formed rAdioCUSTICA radioart archive there. He was a member of the EBU Ars Acustica Group, his music has been broadcast worldwide and performed throughout Europe and in the USA.
As a film music producer he has composed over 50 soundtracks for TV and cinema since 2000.