The Cantigas de Santa Maria are 420 poems with musical notation, written in the medieval Galician-Portuguese language during the reign of Alfonso X of Castile El Sabio (1221–1284). Traditionally, they are all attributed to Alfonso, though scholars have since established that the musicians and poets of his court were responsible for most of them, with Alfonso being credited with a few as well.

Galician–Portuguese, also known as Old Galician–Portuguese, Old Galician or Old Portuguese, Medieval Galician or Medieval Portuguese when referring to the history of each modern language, was a West Iberian Romance language spoken in the Middle Ages, in the northwest area of the Iberian Peninsula. Alternatively, it can be considered a historical period of the Galician, Fala, and Portuguese languages.