Alexandre de Rhodes, S.J. (Vietnamese: A-Lịch-Sơn Đắc-Lộ) (15 March 1591 – 5 November 1660) was a French Jesuit missionary and lexicographer who had a lasting impact on Christianity in Vietnam. He wrote the Dictionarium Annamiticum Lusitanum et Latinum, the first trilingual Vietnamese-Portuguese-Latin dictionary, published in Rome, in 1651.
Alexandre de Rhodes was born in Avignon, now in France. He entered the novitiate of the Society of Jesus in Rome on 24 April 1612 to dedicate his life to missionary work. He arrived in Indochina about 1619. A Jesuit mission had been established in Hanoi in 1615; Rhodes arrived there in 1620. He spent ten years in and around the Court at Hanoi during the rule of Trịnh Tùng and Trịnh Tráng. Rhodes spent twelve years in Vietnam studying under another Jesuit, Francisco de Pina. In 1624, he was sent to the East Indies, arriving in Cochin-China on a boat with fellow Jesuit Girolamo Maiorica. In 1627, he travelled to Tongking, Vietnam where he worked until 1630, when he was forced to leave. He was expelled from Vietnam in 1630 as Trịnh Tráng became concerned about the spread of Catholicism in his realm. Rhodes in his reports said he converted more than 6,000 Vietnamese. Daily conversation in Vietnam "resembles the singing of birds", wrote Alexandre de Rhodes.