The Republic of Letters (Res Publica Litterarum or Res Publica Literaria) was the long-distance intellectual community in the late 17th and 18th centuries in Europe and the Americas. It fostered communication among the intellectuals of the Age of Enlightenment, or philosophes as they were called in France. These communities that transcended national boundaries formed the basis of a metaphysical republic. Because of societal constraints on women, the Republic of Letters consisted mostly of men.
The Republic of Letters relied heavily on handwritten letters for correspondence.