Place Denfert-Rochereau, previously known as Place d'Enfer, is a public square located in the 14th arrondissement of Paris, France, in the Montparnasse district, at the intersection of the boulevards Raspail, Arago, and Saint-Jacques, and the avenues René Coty, Général Leclerc, and Denfert-Rochereau, as well as the streets Froidevaux, Victor-Considérant and de Grancey. It is one of the largest and most important squares on the left bank of the Seine.

The 14th arrondissement of Paris, officially named arrondissement de l'Observatoire, is one of the 20 arrondissements of the capital city of France. It is situated on the left bank of the River Seine, containing most of the Montparnasse district. Although today Montparnasse is best known for its skyscraper, Tour Montparnasse, as well as its major railway terminus, Gare Montparnasse, these are both actually located (partly) in the neighbouring 15th arrondissement. The district has traditionally been home to many artists as well as a Breton community, arrived at the beginning of the 20th century upon the creation of the Montparnasse railway terminus.