||High Entropy Alloys (HEAs) typically have five or more principal elements in (near) equimolar ratios. Due to their unique or attractive properties, HEAs exhibit great potential for many industrial applications. However, much research is needed to establish relationships between composition, microstructure, processing and properties, and to devise new methods to rapidly explore the vast new composition and microstructure spaces. The World Congress on High Entropy Alloys (HEA 2019) will convene stakeholders and researchers from academia, government, and industry across the world who are involved in HEA modeling and simulation, experimental characterization, and alloy design to address both fundamental issues and potential engineering applications. HEA 2019 will cover the growing field of complex, concentrated alloys (CCAs) broadly, including materials that may not meet strict HEA definitions but nevertheless display attractive features. Thus, HEA 2019 will include metallic, intermetallic and ceramic high entropy materials, and also includes both single- and multi-phase microstructures.