This book constitutes the refereed proceedings of the 24th International Conference on Collaboration and Technology, CRIWG 2018, held in Costa de Caparica, Portugal, in September 2018. The 11 revised full papers presented together with 6 short papers were carefully reviewed and selected from 32 submissions. The papers published in the proceedings of this year span dierent areas of collaborative computing research, from collaborative learning to collaboration through social media and virtual communities.