Louis de Caix d'Hervelois was a composer of chamber music.
Caix d'Hervelois wrote music almost exclusively for the viol. Most of his other works exist as transcriptions from his viol music. A native of the north of France, almost nothing is known of his life. However, his changing addresses appear in his published music as well as in passing in contemporary discussions of the viol, and in brief notes in archives. The longest archival text (1697) documents a request by a canon of Sainte-Chapelle, annoyed by the noise of the young chapelain ordinaire Caix learning to play the viol, that Caix practice in a room under the stairs. Louis de Caix d'Hervelois was a pupil of the great Marin Marais.