Abstract: The invention relates to a sonotrode (100; 100?; 100?), comprising a sonotrode body (10; 10?; 10?), which has at least one contact region (12; 12?; 12?) for applying high-frequency mechanical vibrations, introduced at at least one introduction region (14; 14?; 14?) of the sonotrode body (10; 10?; 10?) by a vibration unit, to at least one workpiece (200; 200?; 200?) or material or to a further tool acting thereon, and a heat dissipation device, by means of which heat can be dissipated from the contact region.