The Gaillon neighbourhood, situated in the second arrondissement of Paris, is the fifth administrative district of the capital. Due to its western location and its triangular shape, it is wedged between the 9th arrondissement (north), the 1st arrondissement (south) and the Vivienne neighbourhood (east). The streets delimiting Gaillon are:
- Boulevard des Italiens and Boulevard des Capucines (north) ;
- Rue Saint-Anne and rue de Gramont (east) ;
- Rue des Petits-Champs and rue Danielle Casanova (south).
The Gaillon neighbourhood covers an 18.8 ha area.