Porte-de-Benauge (Gascon: Pòrta de Benauja) is a commune in the Gironde department in southwestern France. It was established on 1 January 2019 by merger of the former communes of Arbis (the seat) and Cantois. On 1 January 2025, the former commune of Saint-Genis-du-Bois was merged into Porte-de-Benauge.