Quirino is a landlocked province in the Philippines, located in the Cagayan Valley region on the island of Luzon. It is one of the provinces that make up the Cagayan Valley administrative region, and, being landlocked, it has no coastline.
Its capital is Cabarroguis, while Diffun is the most populous municipality in the province. The province is named after Elpidio Quirino, the sixth President of the Philippines.