This book constitutes the proceedings of the 14th International Conference on Intelligent Virtual Agents, IVA 2014, held in Boston, MA, USA, in August 2014. The 14 full and 24 short papers presented were carefully reviewed and selected from 78 submissions. In addition, the volume includes 25 demo and poster papers which were on display during the conference. The papers cover many aspects of intelligent virtual agent theory and application with a special focus on their use in healthcare.