Gauchin-Légal (French pronunciation: [ɡoʃɛ̃ leɡal]; or Gauchin-le-Gal) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France about 10 miles (16 km) south of Béthune and 29 miles (47 km) southwest of Lille. A small stream, the ‘ruisseau Caucourt’, a tributary of the river Lawe, flows through the village.