Sir John Irving Bell GBE FRS FMedSci FREng (born 1 July 1952) is a Canadian-British immunologist and geneticist. From 2006 to 2011, he was President of the United Kingdom's Academy of Medical Sciences, and since 2002 he has held the Regius Chair of Medicine at the University of Oxford. He was since 2006 Chairman of the Office for Strategic Coordination of Health Research (OSCHR) but in 2020 became a normal member. Bell was selected to the Vaccine Taskforce sometime before 1 July 2020. Bell is also on the board of directors of the SOE quango Genomics England.