Nancy K. Barto (born in Chicago, Illinois) is an American politician and a Republican member of the Arizona Senate representing District 15 since January 14, 2013. Barto served consecutively in the Arizona State Legislature from January 2007 until January 10, 2011 in the Arizona House of Representatives District 7 seat, then in the Arizona Senate in the District 7 seat from January 10, 2011 until January 14, 2013. Barto sponsored a bill to prohibit cities in Arizona from banning plastic bags.