The Kalanguya (also sometimes referred to as the Ikalahan) are an Austronesian ethnic group most closely associated with the Philippines' Cordillera Administrative Region, but whose core population can be found across an area which also includes the provinces of Nueva Vizcaya, Nueva Ecija, and Pangasinan. While this area spans Region I, the Cordillera Administrative Region, and Region II, it represents a largely geographically contiguous area.
The term "Kalanguya" is sometimes also used to refer to the Kalanguya people's native Kallahan language. Kalanguya was once the most spoken language in most parts of today's Benguet, Nueva Vizcaya, Ifugao, Mt. Province, and some parts of Nueva Ecija but was laterly not due to ethnocentrism.
The Kalanguya population in Nueva Vizcaya has also been identified in anthropological literature as "Ikal-lahan".