 Metallic biomaterials used in medical devices for humans have high corrosion resistance and durability, which affects their functionality and biocompatibility. The body environment poses challenges with respect to corrosion control, and this review paper analyzes the effects of corrosion on biocompatibility, discusses the kinetics of corrosion, passivity, breakdown, and regeneration in vivo, reviews commonly used metallic biomaterials and their corrosion highlights principles of implant failure, retrieval, and failure analysis, describes common corrosion processes in vivo, and approaches to control corrosion. This article was authored by Nome Ilias.