Margarita María López de Maturana was a Spanish Catholic nun born in Bilbao in 1884. A member of the Order of the Blessed Virgin Mary of Mercy, she founded the Mercedarian Missionaries of Bérriz and served as its first superior general. Despite suffering from chronic health issues, including a severe ulcer that eventually became stomach cancer, she traveled extensively to support missionary work in locations such as China and the Northern Mariana Islands. She died in Berriz in 1934.