In this chapter describes the use of superconducting magnets for energy storage. It begins with an overview of the physics of energy storage using a current in an inductor. This is followed by a brief history of superconductivity, beginning in 1911 with the initial observation of superconductivity in elemental mercury by Kammerling Onnes. The basic physics of superconductivity is discussed along with a summary of recent developments in high temperature superconductivity. The use of superconducting magnets for energy storage is discussed and particular applications are considered.