This book constitutes the proceedings of the 13th International  Conference on Transforming Digital Worlds, iConference 2018, held in Sheffield, UK, in March 2018.The 42 full papers and 40 short papers presented together with the abstracts of 3 invited talks in this volume were carefully reviewed and selected from 219 submissions. The papers address topics such as social media; communication studies and online communities; mobile information and cloud computing; data mining and data analytics; information retrieval; information behaviour and digital literacy; digital curation; and information education and libraries.