Mercedes Arrastia Tuason
 Maria Mercedes Reinares y Arrastia-Tuason also known as Mercedes Tuason (born February 27 1930) in Lubao Pampanga is a Philippine diplomat and ambassador to the Holy See. An alumnus of Saint Scholastica's Catholic college in Manila Tuason has served in the field of nutritional sciences and was appointed plenipotentiary to the Holy See in 2009.