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The growth rate of magnesium casting production in North America has averaged 16.6 percent per year over the last ten years.¹⁻³ The fastest growing application for magnesium is the high-pressure die casting for automotive components, which represents approximately 70–80% of the magnesium casting shipments in recent years. This paper presents the latest developments in magnesium alloys, product design, casting technology, surface finishing, and magnesium-matrix composites. Current and future automotive applications of magnesium castings are also discussed.