Introduction to the special issue on Additive Manufacturing and Acoustics.

Additive manufacturing (AM) has expanded to a wide range of applications over the last few years, and acoustic applications are no exception. This article is an introduction to the special issue of the Journal of the Acoustical Society of America on AM and acoustics. To provide background to the reader, a brief introduction to the manufacturing approach of AM is included. The ways in which the articles in this special issue advance the field of acoustics are described for a range of applications.