Professor Roy Thomas Severn CBE DSc PhD FREng FICE (6 September 1929 – 25 November 2012) was a British civil engineer and earthquake engineering expert. Severn studied mathematics at Imperial College London and achieved a doctorate in civil engineering based upon his work on the design of Dukan Dam. After completing his National Service he accepted a position as lecturer in civil engineering at the University of Bristol, where he would spend the rest of his career. Severn specialised in earthquake engineering and established the Earthquake Engineering Research Centre at the university which became one of the foremost institutions in the world within the field. He served as pro-vice chancellor of the university and as president of the Institution of Civil Engineers.