Étienne Loulié (French: [etjɛn lulje]; 1654 – 16 July 1702) was a musician, pedagogue, and musical theorist.
During these same years, he formed a lifelong friendship with Sébastien de Brossard, who became a famed collector of musical scores and preserved Louliè's papers by including them in his donation to the Royal Library (today, the Bibliothèque nationale de France).
All three devices received the approbation of the French Académie des Sciences, and in 1699 Loulié personally presented his sonomètre before that august body.
Loulié's contacts with René Ouvrard and with collector François Roger de Gaignières of the Hôtel de Guise, and his collaboration with Joseph Sauveur, stirred Loulié's curiosity about "ancient" music (la musique ancienne).
His manuscripts reveal a researcher who was very familiar with the writings of Marin Mersenne and of musical theorists who flourished prior to 1600.