Mario Daniel Pierani Verstraete (born 25 July 1978) is a former Argentine footballer. He had successful spells at San Luis de Quillota and Coquimbo Unido.
Born in , Santa Fe, Argentina, Pierani began his football career with local semi-professional sides Juventud Unida de Venado Tuerto, General Belgrano de Santa Isabel, Argentino de Rosario and Cultura de Murphy. He continued to play for semi-professional clubs in Santa Fe Province, Argentina until 2009, in addition to stints with Uruguayan clubs Basáñez and Deportivo Colonia, when he moved to Chile.
After seven years in Chile, including one season in the Primera División with San Luis, Pierani returned to Argentina. He scored the goal that qualified for the final stage of the 2015âÂÂ16 Copa Argentina.