The collegiate church of Santa María or Vigo co-cathedral is a Catholic temple. It shares the cathedral seat of the diocese of Tuy-Vigo with the cathedral of Tuy.

Its construction dates back to the early 19th century, when it replaced the old collegiate church, damaged after the explosion of a powder magazine in 1809.

The project was entrusted to Melchor de Prado y Mariño, an academic at the Royal Academy of San Fernando who presented it in 1811, although the works did not begin until 1816 due to the war against the Napoleonic invasion. The works were completed in 1838, with the construction of the tabernacle and the side altars.

It is worth highlighting the large mosaics that are housed in its main altar, the work of the prestigious Spanish mosaicist Santiago Padrós characterized by two characteristics: the monumentality and the geometricization of the landscape. On its arched pillars, Padrós placed two angels, one carrying the tablets of the Law and the other the Holy Gospels, the cities that can be seen at the feet of both angels are especially interesting: on the one hand, the city of Istanbul (the old Constantinople ) and on the other the city of Rome where Padrós shuffled a rich cast of images (the pyramid of Caio Cestio and the Colosseum can be appreciated).

There are records of the existence of a church dedicated to Santa María located in Vigo since at least the 12th century. This is how it appears in a document of 1156 in which the parishes of the diocese of Tuy are divided between Bishop Don Pelayo Méndez and his council. It is also mentioned in another document from 1170 by which King Ferdinand II of León grants the church to the bishopric as compensation for other territories taken for the Crown.