Augmented Reality (AR) and Virtual Reality (VR) technologies have much to offer the early childhood classroom. AR apps enable virtual objects and artefacts to be layered over the physical environment, whilst VR fully immerses the user in a virtual world. In this document, we explore some of the research undertaken by researchers in the DigiitEY Cost Action, and examine the ways in which AR and VR might be used in early years classrooms. Marsh and Yamada-Rice (in press), drawing on their studies of children’s use of AR and VR apps (Marsh et al., 2015; Yamada-Rice et al., 2017), outlined five key principles which should underpin the use of AR and VR in the classroom. These are discussed throughout this document.