The Welsh School is a name that it is attributed to the security studies school at the Aberystwyth University. The Welsh School has been one of the leading critical security schools and it draws all the attention with the contributions of the scholars such as Ken Booth, Richard Wyn Jones, Andrew Linklater, and Pınar Bilgin. The school criticizes the approach of Traditional Security Studies that locates its analysis on a state as a central concern of the study and declares that traditional security approaches are not sufficient for the security needs of today.

Bary Buzan is a scholar from the Copenhagen School.