This book constitutes the refereed proceedings of the 4th International Conference on Distributed, Ambient, and Pervasive Interactions, DAPI 2016, held as part of the 18th International Conference on Human-Computer Interaction, HCII 2016, held in Toronto, ON, Canada, in July 2016 and received a total of 4354 submissions, of which 1287 papers were accepted for publication after a careful reviewing process. These papers address the latest research and development efforts and highlight the human aspects of design and use of computing systems. The papers accepted for presentation thoroughly cover the entire field of human-computer interaction, addressing major advances in knowledge and effective use of computers in a variety of application areas. This volume contains papers addressing the following major topics: designing and developing smart environments; tracking and recognition techniques in ambient intelligence; human behavior in smart environments; emotions and affect in intelligent environments; and smart cities and communities.