Foz do Arelho is one of twelve civil parishes (freguesias) in the municipality of Caldas da Rainha, Portugal.

[2] Foz do Arelho is located 8 km west of Caldas da Rainha, in the northwest end of the council, and is limited north by the Atlantic Ocean and by the parish of Serra do Bouro.

The parish of Foz do Arelho as a total area of 9.62 square kilometres (3.71 sq mi)[2] in which live 1,339 inhabitants.

[1] Most of the local inhabitants work in industry and services in Caldas da Rainha, but there is also a considerable number dedicated to touristy activities, seafood fishing (bivalve molluscs), and agriculture.

For those who are expert and daring enough to venture out into the waves, the lagoon offers an ideal launching place and a safe harbour to return to.