The introductory chapter provides a brief reference to the issue of corrosion and corrosion damage to aircraft structures. Depending on the nature and dimensions of this nonuniformity, three different categories of corrosion are defined: uniform, selective and localized corrosion. The following chapters present the forms of corrosion that can occur in three defined categories of corrosion. Conditions that cause certain types of corrosion in various corrosive environments are discussed. Examples of corrosion processes are listed and mechanisms of these processes are briefly described. And, as a conclusion, the last chapter presents the summary of investigations of corrosion and corrosion damage to aircraft structures.