Jean‑François Champollion’s *Lettre à M. Dacier relative à l'alphabet des hiéroglyphes* presents the scholar’s correspondence with the French classicist Michel‑Charles Le Couteur Dacier concerning the decipherment of Egyptian hieroglyphic signs. In this concise 96‑page pamphlet, Champollion outlines his arguments for the phonetic nature of the script and defends his methodology against contemporary criticism. The work offers a rare glimpse into the intellectual exchange that helped lay the foundations of modern Egyptology, illustrating both the scholarly rigor and the personal conviction that drove Champollion’s groundbreaking discoveries. Published by Fata Morgana in 1984, the softcover edition makes this historic letter accessible to readers interested in the early history of decipherment and the development of linguistic archaeology.