This volume contains the proceedings of the 1st International Conference on A?ective Computing and Intelligent Interaction (ACII 2005) held in Beijing, China, on 22-24 October 2005. Traditionally, the machine end of human-machine interaction has been very passive, and certainly has had no means of recognizing or expressing a?ective information. But without the ability to process such information, computers cannot be expected to communicate with humans in a natural way. The ability to recognize and express a?ect is one of the most important features of - man beings. We therefore expect that...