The 4th arrondissement of Paris is one of the twenty arrondissements of the capital city of France. In spoken French, this arrondissement is referred to as quatrième. Along with the 1st, 2nd and 3rd arrondissements, it is in the first sector of Paris, which maintains a single local government rather than four separate ones.

The 1st arrondissement of Paris is one of the 20 arrondissements of the capital city of France. In spoken French, this arrondissement is colloquially referred to as le premier. It is governed locally together with the 2nd, 3rd and 4th arrondissement, with which it forms the 1st sector of Paris (Paris-Centre).