Peter Kowald (April 21, 1944 – September 21, 2002) was a German free jazz double bassist and tubist. A member of the Globe Unity Orchestra, and a touring double-bass player, Kowald collaborated with a large number of European free jazz and American free-jazz players during his career, including Peter Brötzmann, Irène Schweizer, Karl Berger, Fred Anderson, Hamid Drake, Karl E. H. Seigfried, Conny Bauer, Jeffrey Morgan, Wadada Leo Smith, Günter Sommer, William Parker, Barre Phillips, Joëlle Léandre, Alfred Harth, Lauren Newton and Evan Parker. He also recorded a number of solo double-bass albums, and was a member of the London Jazz Composer's Orchestra until 1985. He also recorded a number of pioneering double bass duets with Maarten Altena, Barry Guy, Joëlle Léandre, Barre Phillips, William