This technical committee report reviews the corrosion of reinforcing and prestressing steel in concrete structures caused by stray currents. It provides information on the history of stray-current corrosion, the sources of stray currents, the mechanism of corrosion, the effects on structures, and detection and mitigation of stray-current-induced corrosion on steel in concrete. Also covered are measures taken during the design phase and modelling of the stray-current effects. The report is intended for use by designers of reinforced concrete structures, professionals dealing with electrochemical techniques (e.g., cathodic protection, realkalization, and electrochemical chloride removal), owners of structures with the potential for reinforcement corrosion caused by stray currents, owners of systems that could generate stray currents to concrete structures, and electrical engineers.