Augmented Reality (AR) bridges the real and the digital. It is part of the Extended Reality (XR) spectrum of immersive technological interfaces. At one end of the continuum, Virtual Reality (VR) immerses users in fully digital simulations which effectively substitute for the real world. At the other end of the continuum, AR allows users to remain immersed in the real world while superimposing digital overlays on the world. The term "mixed reality," meanwhile, is sometimes used as an alternative to AR and sometimes as an alternative to XR. This chapter describes examples of the use of AR tools in the classroom and discusses the benefits and potential issues of using AR in education contexts. [For the complete volume, see ED612143.]