This volume constitutes the refereed proceedings of the 4th International Conference of the  Immersive Learning Network, iLRN 2018, held in Missoula, MT, USA, in June 2018. The 12 revised full papers and the two revised short papers presented in this volume were carefully reviewed and selected from 57 submissions. The papers are organized in topical sections on environmental sciences, climate change, immersive technologies; immersive technologies in cultural heritage; immersive technologies in primary and secondary education; games and game design.