This collection from the 12th International Conference on Magnesium Alloys and Their Applications (Mg 2021)¿the longest running conference dedicated to the development of magnesium alloys¿covers the breadth of magnesium research and development, from primary production to applications to end-of-life management. Authors from academia, government, and industry discuss new developments in magnesium alloys and share valuable insights.Topics in this volume include but are not limited to the following:Primary productionAlloy developmentSolidification and casting processesForming and thermo-mechanical processingOther manufacturing process development (including joining and additive manufacturing)Corrosion and protection Modeling and simulationStructural, functional, biomedical, and energy applicationsAdvanced characterization and fundamental theoriesRecycling and environmental issues