Barry Gordon Buzan, FBA, FAcSS (born 28 April 1946) is a British political scientist. He is an Emeritus Professor of International Relations at the London School of Economics and a honorary professor at the University of Copenhagen and Jilin University. Until 2012 he was Montague Burton Professor of International Relations at the LSE. Buzan sketched the Regional Security Complex Theory and is therefore together with Ole Wæver a central figure of the Copenhagen School.