The Zambales Mountains is a mountain range on western Luzon island in the Philippines. The mountains spread along a north-south axis, separating Luzon's central plain from the South China Sea. The range extends into five provinces: Zambales, Pangasinan, Tarlac, Pampanga, and Bataan. One of its most prominent sections is known as the Cabusilan Mountain Range composed of Mount Pinatubo, Mount Negron and Mount Cuadrado, which are believed to be remnants of the ancestral Pinatubo peak. The highest elevation in the Zambales Mountains is Mount Tapulao, also known as High Peak, in Zambales province which rises to 2,037 metres (6,683 ft).

Zambales, officially the Province of Zambales, is a province in the Philippines located in the Central Luzon region. Its capital is Iba, which is located in the middle of the province. Zambales borders Pangasinan to the north and northeast, Tarlac to the east, Pampanga to the southeast, Bataan to the south and the South China Sea to the west. With a total land area of 3,830.83 square kilometres (1,479.09 sq mi), Zambales is the second largest among the seven provinces of Central Luzon after Nueva Ecija. The province is noted for its mangoes, which are abundant from January to April.