Galician-Portuguese, also known as Old Portuguese or Medieval Galician, was a West Iberian Romance language spoken in the Middle Ages, in the northwest area of the Iberian Peninsula. It was first spoken in the area bounded in the north and west by the Atlantic Ocean and the Douro River in the south but it was later extended south of the Douro by the Reconquista. It is the common ancestor of modern Galician, Portuguese, Eonavian and Fala languages, and the extinct Judaeo-Portuguese language.

The term “Galician-Portuguese” also designates the subdivision of the modern West Iberian group which is composed by Galician, Portuguese, and the Fala language.

Portuguese and Galician (spoken in north-west Spain) have the same root and, together with Sardinian, are unique amongst the Romance languages in their use of the “personal infinitive”, which doesn’t exist for example in either English or Spanish.