Mirtha María Teresita Luna (born 19 February 1964) is an Argentine politician. Formerly a member of the Justicialist Party, she served as Vice Governor of La Rioja Province from 2007 to 2011, and later as a National Senator for La Rioja from 2011 to 2017. In 2019, she left the Justicialist Party and became part of the Cambiemos coalition. Since 2021, she has been a member of the provincial legislature of La Rioja, a position she previously held from 2005 to 2007.