Gallia Narbonensis (Latin for "Gaul of Narbonne", from its chief settlement) is a Roman province located in what is now Languedoc and Provence, in southern France.

It is also known as Provincia Nostra ("our Province"), from its having been the first Roman province north of the Alps, and as Gallia Transalpina ("Transalpine Gaul"), distinguishing it from Cisalpine Gaul in northern Italy.

It becomes a Roman province in the late second century BCE.

Its boundaries are roughly defined by the Mediterranean Sea to the south and the Cévennes and Alps to the north and west.

The western region of Gallia Narbonensis is known as Septimania.