Ken Booth FBA (born 29 January 1943) is a British international relations theorist, and the former E H Carr Professor of the Department of International Politics at Aberystwyth University. He has been a visiting researcher at the Naval War College in Newport, Rhode Island; at Dalhousie University in Halifax, Canada; and at Cambridge University. He is a former Chair, and the first President of the British International Studies Association. He was part of the editorial team of the Review of International Studies, and currently serves as both Academic Editor of the Lynne Rienner Critical Security Studies series and the journal International Relations.