François Antoine de Legall de Kermeur was a French chess player. His name is variously written Kermur, Sire de Legalle, by Twiss, and Kermur and Kermuy, Sire de Legal, by others. In the List of Subscribers to Philidor's second edition it stands as in Twiss, but the spelling was, probably, in both cases Philidor's own.
Along with other famous players, he played in Paris's Café de la Régence, and is considered to have been possibly the strongest player in the world around the 1730s. He taught chess to François-André Philidor.