The quartier du Petit-Montrouge is number 55 of the 80 quartiers administratifs in Paris. It lies in the 14th Arrondissement, in the south of the capital. It owes its name to the adjacent commune of Montrouge, of which it formed a part before 1860. It is familiar as the quartier Alésia, from the name of a street that bisects it and from the principal Métro station that serves it, although the quartier Alésia does not exactly overlap the quartier du Petit-Montrouge.