This article examines anger concepts and an anger reduction method found in Theravada Buddhist Sutta-pitaka scripture. The scripture defines anger, discusses its origin, anger-related behaviors and consequences, and suggests an anger reduction method that involves not responding to anger provocation, treating others with loving kindness, and neither seeking revenge nor using violent means. Buddhist anger concepts and the anger reduction method are supported by extensive social psychological research. Buddhist anger concepts increase our understanding of anger, provide a framework to advance psychological study of anger, and guide the development of a theory of anger, whereas Buddhist anger reduction method may be used to reduce harmful effects of anger. Future research on Buddhist anger concepts should focus on the relationships between loving kindness and anger reduction, and between anger and hatred, and on cross-cultural research. Buddhist anger reduction method may pave the way toward harmonious interpersonal, intergroup, and international relationships.