Johannes "Hannes" Bauer (July 22, 1954 – May 6, 2016) was a German trombonist of improvised music and free jazz. He was the brother of the trombonist Conny Bauer.
He was born in Halle. From 1979 onwards, he worked as a freelance musician in Berlin.
Among others, he worked with the following groups: the Manfred Schulze Wind Quintet, Doppelmoppel (with Conny Bauer, Uwe Kropinski, and Helmut "Joe" Sachse), Slawterhaus (with Jon Rose, Peter Hollinger, and Dietmar Diesner), Futch (with Thomas Lehn and Jon Rose), Ken VandermarkTerritory Band, and the Peter Brötzmann Tentet.