Chai-Sik Chung (born July 14, 1930 in Wonju, Korea) is an American social ethicist and sociologist of religion. He studied under Walter George Muelder at the Boston University School of Theology, where he served as the Walter G. Muelder Professor of Social Ethics from 1990 to 2011. He also studied under the late Robert N. Bellah at Harvard Divinity School with whom he had been long associated.