Roger William Herbert Sargent PhD, DSc(Eng), D.hc(INPL, Nancy), ACGI, Hon FCGI, FIChemE FIMA FREng FSA (14 October 1926 – 11 September 2018) was a British chemical engineer. He was the Courtaulds Professor of Chemical Engineering at Imperial College London and "the father" of the discipline of Process Systems Engineering. He was born in Bedford, Bedfordshire.