Miranda de Souza Canavarro (1849-1933) was a Portuguese noblewoman, notable as the first woman to convert to Buddhism on American soil (in 1897) and later a Buddhist nun in Ceylon. While in America she was often known as Marie. She was the wife of the Portuguese ambassador to Sandwich Islands, who began a secret "spiritual marriage" to New York attorney and Buddhist sympathizer Myron Henry Phelps. She converted to Buddhism in 1897 under the discipleship of Anagarika Dharmapala, then moved to Ceylon as Sister Sanghamitta.