La Union (Ilocano:Probinsya ti La Union, Pangasinan:Luyag na La Union, Tagalog:Lalawigan ng La Union), is a province in the Philippines located in the Ilocos Region in the island of Luzon. Its capital is the city of San Fernando.

The province is bordered by Ilocos Sur to the north, Benguet to the east, Pangasinan to the south, and to the west by the shores of the South China Sea.