This paper reviews Operations Research (OR)/Management Science (MS) in Korea. After a brief survey of global OR/MS, this paper analyzes the research trend in Korea over the past forty years with respect to approach, methods, types of data, and so on. The OR/MS application and practice in Korea are also surveyed and the change of them with time is shown. To do this, we refer to four main OR/MS journals published in Korea. The future of OR/MS is discussed in practice, methods to problem-solving, and education.