María Fabiana Ríos (born March 31, 1964 in Rosario, Santa Fe) is an Argentine politician and founder of the Patagonian Social Party. She was the governor of the province of Tierra del Fuego from December 17, 2007 to December 10, 2015. She was first elected with the support of the party ARI ("Afirmación para una República de Iguales", "Support for an Egalitarian Republic"), but she left it in 2010 and created her own party, with which she was re-elected. She was the only female governor in Argentina, until the election of Lucia Corpacci of Catamarca Province. She was succeeded in office by another woman, Rosana Bertone.