群体动力学，或称团体动力学、集团力学（英文：group dynamics），在共同工作时会出现的各种心理学和社会学现象、机制和过程的学科。

比如：

• 对小群体特殊机制的描述、分析的研究。
• 研究小群体的发展对整个大群体的影响。
• 通过研究小群体的人际关系掌握整个群体的一些现象的根源。

群体动力学不同于群体精神分析学或者群体心理疗法。

Group dynamics is a system of behaviours and psychological processes occurring within a social group (intragroup dynamics), or between social groups (intergroup dynamics). The study of group dynamics can be useful in understanding decision-making behavior, tracking the spread of diseases in society, creating effective therapy techniques, and following the emergence and popularity of new ideas and technologies. Group dynamics are at the core of understanding racism, sexism, and other forms of social prejudice and discrimination. These applications of the field are studied in psychology, sociology, anthropology, political science, epidemiology, education, social work, business, and communication studies.