Águas Santas is a Portuguese town and parish located in the municipality of Maia.

The first references to Águas Santas are found in a document dating from the year 1120, where Pope Callixtus II mentions the monastery of Aquis Sanctis.

[3] The origin of the parish of Águas Santas predates the formation of the nationality, and there are even traces of its existence as far back as the 6th century.

However, the oldest known document dates back to 1405, and the records of 1120 include a reference to Sancta Marya Aquis Sanctis in a charter donated by the city of Porto to Bishop Hugo.

For this reason, the cross of the Order of Malta[3] is included in the municipal coat of arms.