The research paper deals with the subject of the psychological aspect in the dialogue of civilizations in terms of the types of personalities and their effects in a preface that regulates the search terms to define the psychological aspect and clarify what is meant by the dialogue of civilizations both linguistically and terminologically. Then, the researcher tackles two topics, the first is about the analysis of the psychological patterns of the interlocutors and the rules for dealing with them which subsume two requirements, the first about the psychological patterns of the interlocutors and the second about the rules for dealing with these patterns in the civilized dialogue. The second topic, it deals with the psychological effects in the dialogue of civilizations, and there are two requirements under it as well. Thefirst concerns the negative effects, and the second the positive effects. The Research adopts the descriptive analytical approach and utilizes the topics of psychology in the practice of the dialogue of civilizations to synthesize and mix knowledge between two different fields of knowledge to establish a construct capable of achieving cognitive integration between disciplines. Then the research paper reaches a number of conclusions, such as: The psychological patterns of interlocutors are numerous, including the nervous, the curious, the quarrelsome, and the quiet patterns. And among the rules for dealing with these patterns are: defining the psychological pattern, understanding the behavior, promoting spiritual nourishment and purity of faith, featuring discipline and psychological balance, and highlighting the need for guidance and psychological counseling. As for the psychological effects in the dialogue of civilizations, they are divided into negative ones, such as introversion, avoidance of dialogues, a sense of meaninglessness, the absence of goals, projecting interlocutors, and sabotaging dialogue. In contrast, the positive ones include: accepting difference, acceptance of dialogue, psychological exploration, self-review, emotional sharing, and continuous interaction. The paper recommends the need to activate the theory of psychology in the practice of the dialogues of civilizations, and to delve deeper into conducting research studies, especially the field ones to cover this topic, in order to be effective in the studies on the dialogue of civilizations.