Margot Roosevelt (Margot Hornblower) is an American journalist. She covers the Southern California economy for the Orange County Register and Los Angeles Register. Before that, she wrote for The Washington Post, then for Time magazine, for the Los Angeles Times from 2007 to 2011 and for Reuters on the 2012 Presidential election. Besides the economy, her fields have included foreign affairs, US Congress, and the environment, including climate change and air pollution. She is a fellow of the University of Southern California's Los Angeles Institute for the Humanities.
Roosevelt is the daughter of Edith Kermit Roosevelt and Alexander Gregory Barmine; Roosevelt's maternal grandfather is Archibald Roosevelt, the son of US President Theodore Roosevelt. Roosevelt graduated from Harvard University  with a degree in history, having attended the Lycée Français de New York. She was married to Ralph Hornblower III; they divorced in 2000. She was known as Margot Hornblower from 1969 to 2000. She has two sons, Sam and Luke Hornblower.
Roosevelt was a staff correspondent of the Washington Post for 13 years, during which time she was the New York bureau chief for four years, congressional correspondent in Washington, D.C. for three years, and chief environmental correspondent for three years. She joined Time magazine in 1987, reporting from Time's Paris bureau from 1988 to 1994, when she moved to Los Angeles.
Roosevelt was a 2010 National Center for Atmospheric Research Journalism Fellow and 2010 Climate Media Fellow of the Earth Journalism Network. In 2011, Roosevelt received the award for "Distinguished Science Journalism in The Atmospheric and Related Sciences" from the American Meteorological Society.
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- National Center for Atmospheric Research, Bios for NCAR Journalism Fellows
- Earth Journalism Network, EJN 2010 Climate Media Fellowship for US Journalists
- "2011 AMS Award Recipients". American Meteorological Society. Archived from the original on April 14, 2011.