Memeskia (c. 1695 – June 21, 1752), known as "Old Briton" by the British and as "La Demoiselle" by the French, was an eighteenth-century Piankashaw chieftain who fought against the French in 1747. In November 1750, he signed a friendship treaty with the British Indian agent, George Croghan, which was cemented during a visit by Indian scout Christopher Gist in February 1751. Memeskia was an Miami Indian.