The Têt (; ) is the largest river in Pyrénées-Orientales, southwestern France. It is long. The Têt has at the foot of the Puig de la Cometa de l'Espagne in the Carlit massif in the eastern Pyrenees. It crosses the Pyrénées-Orientales département (Northern Catalonia) from West to East and ends in the Mediterranean Sea, near Perpignan ().
A staircase of along the length of the valley has been studied in detail.