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Naomi Klein (born May 8, 1970) is a Canadian author, social activist, and filmmaker known for her political analyses, support of ecofeminism and organized labour, and criticism of corporate globalization, fascism, and capitalism.

Klein first became known internationally for her alter-globalization book No Logo (1999). The Take (2004), a documentary film about Argentine workers' self-managed factories, written by her and directed by her husband Avi Lewis, further increased her profile. The Shock Doctrine (2007), a critical analysis of the history of neoliberal economics, solidified her standing as a prominent activist on the international stage and was adapted into a six-minute companion film by Alfonso and Jonás Cuarón, as well as a feature-length documentary by Michael Winterbottom. Klein's This Changes Everything: Capitalism vs. the Climate (2014) was a New York Times nonfiction bestseller and the winner of the Hilary Weston Writers' Trust Prize for Nonfiction.

In 2016, Klein was awarded the Sydney Peace Prize for her activism on climate justice. Klein frequently appears on global and national lists of top influential thinkers, including the 2014 Thought Leaders ranking compiled by the Gottlieb Duttweiler Institute, Prospect magazine's world thinkers 2014 poll, and Maclean's 2014 Power List. She was formerly a member of the board of directors of the climate activist group 350.org. In 2021, Klein took up the UBC Professorship in Climate Justice, joining the University of British Columbia's Department of Geography. She has been the co-director of the Centre for Climate Justice since it was launched in 2021.