Paço de Arcos or Paço d'Arcos is a locality in the parish of Oeiras and São Julião da Barra, Paço de Arcos and Caxias, in the municipality of Oeiras. On the Lisbon Coast, next to the more Atlantic beaches of the Tagus Estuary, the pleasant riverside atmosphere of the picturesque streets of the locality has made them especially attractive for catering, hospitality, and commerce. Created on January 16, 2013. Resulting from the extinction of the parish with the same name, the village of Paço de Arcos is dubbed by its inhabitants as "the most charming village in Portugal".
The toponymy comes from the Palácio dos Arcos, the most important building in the village, which the people called "Paço" because King Manuel I, the Fortunate, and his daughter Maria would have stayed several times in this palace, to participate in hunts on the estate and to watch the departure of the caravels heading to India.