Louis Barral (1910–1999) was a Monégasque lexicographer.
He was the joint author, with Suzanne Simone, of a French–Monégasque Dictionary (1983). This work complements Louis Frolla's Monégasque–French Dictionary (1963).
The dictionary and other works have contributed to a flourishing of literature in the Monégasque language.
Barral was the keeper of the Prehistoric Anthropology Museum of Monaco.
In April 1958, Louis Barral discovered the Cavern of Vallonnet along with René Pascal.