Karl Wolfgang Deutsch (21 July 1912 – 1 November 1992) was a social and political scientist from Prague.
He was the Stanfield Professor of International Peace at Harvard University.
From 1977 to 1987 he was the Director of Wissenschaftszentrum Berlin (International Institute for Comparative Social Research).
His work focused on the study of war and peace, nationalism, co-operation, and communication.
He is also well known for his interest in introducing quantitative methods and formal system analysis and model-thinking into the field of political and social sciences and is one of the best known social scientists of the 20th century.