The co-cathedral of Santa María de la Redonda is a church located in Logroño.

In the 10th century, the Camino de Santiago crosses the Ebro river over a bridge that gives rise to a town that would eventually become the city of Logroño.

In the year 1095, King Alfonso VI of León granted this place a frank jurisdiction for the settlement of settlers and pilgrims.

With the passage of time the population reached a remarkable growth and the churches of Santa María de Palacio, Santiago el Real, San Bartolomé and Santa María de la Redonda were built, the latter in the suburb and separated from the itinerary of the Camino de Santiago. It was called La Redonda because it is probably an octagonal Romanesque church, similar to those on the Camino de Navarra in Eunate and Torres del Río.

Due to its development and importance, in 1431 it was declared a city and in 1435 it was endowed with a collegiate church, at that time associated with the nearby and important Monastery of Albelda, in whose scriptorium important codices were created in the Middle Ages. Among all the existing temples, La Redonda was chosen and the advisability of building a grandiose temple was seen in the same place where the austere Romanesque was located.

The construction would begin years later in 1516 and in successive reforms and extensions it would last for three centuries.

In 1959 the collegiate church of Santa María de La Redonda was declared a co-cathedral, sharing rank with the historic cathedrals of Calahorra (15th century) and Santo Domingo de La Calzada (11th century).