Patrick J. Michaels (February 15, 1950 – July 15, 2022) was an American agricultural climatologist. Michaels was a senior fellow in environmental studies at the Cato Institute until 2019. Until 2007, he was research professor of environmental sciences at the University of Virginia, where he had worked from 1980. Starting in 1991, he collaborated with Fred Singer to attack the scientific consensus on ozone depletion. He joined the Cato Institute, a libertarian think-tank. He described policies designed to reduce greenhouse gas emissions as "Obamunism".