Aymar de Chaste (died 1603) was a Catholic, French admiral during the Franco-Spanish Wars between 1582 and 1598. A gentleman of the King's Chamber, François Aymar (or Aimar) de Cleremont de Chaste served as governor of Dieppe and Arques-la-Bataille as well as the French ambassador to England during mid to late 16th century. A vice admiral, Chaste commanded the French-Portuguese naval forces supporting António, Prior of Crato's attempt to defend the Azores from Spain to use as a staging point to liberate Portugal. However, he was defeated by Álvaro de Bazán, Marquis of Santa Cruz at the Battle of Terceira in 1583.