Abstract-The aim of this research is to study a pattern of conversational dominance in a thain chat room. Such patterens were based on data collected from the thai chat room located at http://www.pantip.com. The results show that ther was no converstational dominance whenever two people were involved. By contrast, whenever a large number of people were involved, then those who made many greeting and often asked more questions turned out to be the center of conversation or the focus of conversational dominance. The conversational dominance, however,could not be established by the counted numbers of messages being sent. This is because in a chat room,people haveno concern for whether their messages would be replied to or not. A large amount of repeated contents, then , would be conveyed without interactions. This pattern of conversational dominance in a chat room, therefore, seems different from that of face-to-face conversations. The reason for this difference is that less attentionis paid to answers and less care is given to social status. Keywords-conversational dominance, chat room, thai contexts.