Leonard Cox (or Coxe) (c. 1495 – c. 1549) was an English humanist, author of the first book in English on rhetoric. He was a scholar of international reputation who found patronage in Poland, and was friend of Erasmus and Melanchthon. He was known to contemporaries as a grammarian, rhetorician, poet, and preacher, and was skilled in the modern as well as the classical languages.