Nancy K. Barto (born in Chicago, Illinois) is an American politician and a Republican member of the Arizona State Senate since 2021. She previously served in the Arizona House of Representatives from 2019 to 2021 and the Arizona Senate representing District 15 from 2013 to 2019. 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.