Dieter Ammann (born 17 May 1962 in Aarau) is a Swiss composer who plays bass guitar, trumpet, cornet, and keyboard.
As a trumpet player, keyboardist and electric bassist he has played in the free funk band Donkey Kong's Multiscream since the early 1980s and as sideman with Marco Käppeli and other groups such as the international festivals in Cologne, Willisau, Antwerp, and Lugano.
Recordings and studio sessions brought him together with a diverse set of artists such as Eddie Harris, Peter Brötzmann, and Udo Lindenberg.
He studied theory and composition at the Music Academy of the City of Basel and took master classes with Wolfgang Rihm and Witold Lutosławski.
He won the Aargauer Kuratorium, the main prize at the International Composition Competition of the IBLA, a foundation based in New York.