María Rosario Ibarra de la Garza, also known by her marital name Rosario Ibarra de Piedra, is an activist and prominent figure in the politics of Mexico. She has been a presidential candidate and is currently the president of Comité Eureka.
In March 2006, the Party of the Democratic Revolution designated Ibarra as its candidate to the Senate via proportional representation to serve during the LX Legislature and during the LXI Legislature; she won.