This Special Issue contains some substantially expanded versions of conference papers that were originally presented at the Immersive Learning Research Network's (iLRN) 2018 conference, along with others outside of the conference. iLRN is an international organization of developers, educators, and research professionals collaborating to develop the scientific, technical, and applied potential of immersive learning (https://immersivelrn.org). The mission and purpose of iLRN are interwoven throughout the articles in this Special Issue.The author has highlighted how each article in this Special Issue of the Journal of Educational Computing Research addresses a specific gap in the research literature related to (a) immersive learning in specific academic subject areas, (b) the use of different pedagogical approaches in immersive learning environments, and (c) technical affordances of immersive learning environments. Narrowing these gaps aligns with iLRN's mission, which is to invite and organize scientists, practitioners, organizations, and innovators from across the disciplines to explore, describe, showcase, and apply the optimal use of immersive worlds and environments for formal and informal educational purposes.