Louis de Courcillon, known as the abbé de Dangeau was a French churchman and grammarian, best known for being the first to describe the nasal vowels in the French language. Originally a Protestant of Huguenot origin, he converted to Catholicism in 1668 after a trip to Poland. He was a younger brother of Philippe de Courcillon de Dangeau.
- Occupation
- cleric, linguist, romanist, grammarian
- Position held
- Commendatory abbot, seat 12 of the Académie française
- Citizenship
- France
- Born
- January 1643
- Died
