Sir John Theodore Houghton (30 December 1931 – 15 April 2020) was a Welsh atmospheric physicist. He was the co-chair of the Nobel Peace Prize winning Intergovernmental Panel on Climate Change's (IPCC). He was the lead editor of first three IPCC reports. He was professor in atmospheric physics at the University of Oxford. He also was a Director General at the Met Office and founder of the Hadley Centre.