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David Stuart Wratt QSO is the Chief Scientist (Climate) at the National Institute of Water and Atmospheric Research (NIWA) and is responsible for NIWA's National Climate Centre. He has a PhD in atmospheric physics from the University of Canterbury. He has worked in the USA and Australia as well as New Zealand. His expertise includes climate and meteorology, climate change science and impacts, mountain meteorology, and air quality.
He is a Companion of the Royal Society of New Zealand. He chairs the Climate Committee of the Royal Society of New Zealand. He is a member of the Bureau of the Intergovernmental Panel on Climate Change (IPCC) and he is a Vice-Chair of IPCC Working Group 1, which assesses the physical science of climate change.
After gaining a PhD in atmospheric physics from the University of Canterbury and a post-doctoral fellowship at the University of Illinois, he worked for the New Zealand Meteorological Service. In 1992 he and other climate researchers transferred to NIWA.
Wratt has stated:
“There’s a strong scientific case for significantly reducing greenhouse gas emissions. We need a combination of reducing our emissions in New Zealand and being part of international negotiations to reduce emissions globally in order to forestall the worst effects.” 
- CV of David Wratt, Intergovernmental Panel on Climate Change website, retrieved 2009-10-12.
- Members of New Zealand Climate Committee, New Zealand Climate Committee, the Royal Society of New Zealand website, retrieved 2009-10-12.
- David Wratt, 'Our People', National Institute of Water and Atmospheric Research (NIWA) website, retrieved 2009-10-10.
- David Wratt - Climate: Changes, Causes and Consequences Seminar, New Zealand Climate Change Research Institute, 2009-10-08, retrieved 2009-10-10.
- Profile: David Wratt tackles climate change, Water & Atmosphere, Vol.15 No.4 - December 2007, National Institute of Water and Atmospheric Research (NIWA) website, retrieved 2009-10-10.
- "New Year Honours List 2012". Department of the Prime Minister and Cabinet. 31 December 2011. Retrieved 31 December 2011.