Denis Levaillant (born 3 August 1952) is a French composer, pianist and writer based in Paris, France.

[3] Levaillant has been recognized for his improvisation and orchestration work and his ability to synthesize in his art several antagonistic genres such as composition/improvisation, classical/jazz, classical/popular and acoustic/electro.

He began harmony, counterpoint and composition training at the age of twelve, under French music professor, Magdeleine Mangin in 1964, in Nancy, France.

His first music had inspirations from his adolescence heroes, such as Karlheinz Stockhausen, Jimi Hendrix and Ornette Coleman.

He collaborated with and composed music for various French and international jazz musicians such as Jean-Jacques Avenel [fr; de], Didier Levallet, Mino Cinélu, Jean-Louis Chautemps, Pierre Favre, Bernard Lubat, Tony Coe, Kenny Wheeler, Jean-François Jenny-Clark, Michel Portal, Barry Altschul and Barre Phillips.

[14] In 1995, Levaillant was commissioned by Ensemble InterContemporain and Musée du Louvre for creating music for Fritz Lang's last silent film, Woman in the Moon.

[15] Later that year, he co-founded the Cabinet de Musique Généraliste (CMG) with Frédéric Leibovitz [fr], an initiative aimed towards promoting contemporary music in the audiovisual world.

[17] In 2002, Levaillant composed the ballet La Petite danseuse de Degas produced by the Paris Opera.