This volume represents the proceedings of ECSCW 2015, the 14th European Conference on Computer Supported Cooperative Work, held in Oslo, Norway, September 19–23, 2015.ECSCW 2015 received 60 paper submissions. After extensive review, 14 were selected to form the core of the traditional single-track technical programme for the conference. They are published in these proceedings from the conference.This year, exploratory papers have been introduced as a new peer-reviewed cat- egory of short papers. The exploratory papers should represent a more open and daring approach to topics and questions in CSCW and are not only short papers. In total, there were eleven exploratory papers submitted and three were accepted to the conference after extensive review. The three exploratory papers are also included in these proceedings. We gratefully acknowledge the work carried out by the exploratory papers co-chairs Kari Kuutti and Kjeld Schmidt to establish a fair review process for this new category of papers, valuing novelty, openness and a critical approach to CSCW research in Europe. We hope that the exploratory papers will spur reflection, discussion and development of our research field.The papers published in this proceeding are supplemented by workshops, mas- ter classes, posters, demos, videos and doctoral colloquium, all of which cover a broad range of topics and allow for wider and more active participation.The technical programme this year focuses on cooperative work in work set- tings as well as outside of work and on the challenges of involving citizens, patients, and others into collaborative settings. The papers embrace new theories and discuss known ones. They challenge the ways we think about and study work and contribute to the discussions of the blurring boundaries between home and work life. We have theoretical papers as well as papers offering detailed empirical studies. The papers introduce recent and emergent technologies, and study known social and collaborative technologies. Classical settings in computer-supported cooperative work are looked upon anew. With contributions from all over the world, the papers in interesting ways help focus on the European perspective in our community.Many people have worked hard to ensure the success of this conference, and we wish to gratefully acknowledge their crucial contribution: all the authors who submitted high-quality full papers and exploratory papers; all those who contributed through taking part in workshops and master classes, demos and dem- onstrations, doctoral colloquium and posters; the 59-member global programme committee, who dedicated time and energy to reviewing and discussing individ- ual contributions and shaping the programme; the people who helped organise the programme: the workshop and master class chairs, the chairs of demos, videos and posters, the chairs of exploratory papers and doctoral colloquium; and finally, the student volunteers who provided support throughout the event; we thank the spon- sors and those who offered their support to the conference.