The Cathedral of Santa María (Spanish: Catedral de Santa María) is a cathedral located in Calahorra (in La Rioja, Spain). It is one of the cathedrals belonging to the Roman Catholic Diocese of Calahorra y La Calzada-Logroño.

The building was given a heritage listing in 1931, and is currently protected as a Bien de Interés Cultural.^[1]

According to the Roman Christian poet Prudentius, San Emeterio and San Celedonio, two Roman brothers and legionaries who converted to Christianity, were beheaded in Calahorra around the year 300.^[2] Local legend states that the cathedral was built on the spot where the two were killed.^[3] They are now venerated as patron saints of the city and their relics are still kept inside the cathedral.^[3]

The site of the martyrdom become a place of pilgrimage in the 4th century, which led to the construction of a Visigoth baptistery, later destroyed during the Arab conquest.^[4] Following the city's return to Christian rule during Reconquista, the episcopal see was restored in 1045.^[5]

Construction of the current building began in 1484^[6] in the Gothic style, but gained several other influences over the next centuries, the facade and interior decorations being examples of Baroque.^[7] The main work on the cathedral was done by the 18th Century, with the last element added being the retable of the main altar, in 1904,^[8] after the original one was destroyed during a fire in 1900.^[9]