David Stuart Wratt QSO CRSNZ (born 1949) is a New Zealand climate scientist who specialises in meteorology and the science and impact of climate change. He is an adjunct research fellow at the New Zealand Climate Change Research Institute at Victoria University of Wellington, and has had many roles at the National Institute of Water and Atmospheric Research (NIWA), including six years as chief scientist (climate). His current position at NIWA is emeritus scientist (climate). Wratt is a Companion of the Royal Society of New Zealand and was the chair of the society's New Zealand Climate Committee. He has had advisory roles for the New Zealand Government, including science advisor at the Ministry for the Environment, and is currently a member of the Science Board for the Ministry of Business,