The workshop is focused on innovative active and passive materials for the reduction of noise in aeroacoustic applications. Aspects related to theoretical and numerical modelling, advanced design and manufacturing techniques, and dedicated experimental approaches are of relevance to the workshop objectives. Primary goal of the workshop is to encourage the discussion and the cooperation of the research community on this key topic, aiming at the identification of breakthrough concepts to achieve the substantial noise reduction required to guarantee the sustainable development of the aeronautical transportation system.