Wahiawa is a census-designated place in Honolulu County, Hawaii, United States, on the island of Oahu. It is in the Wahiawa District, on the plateau or "central valley" between the two volcanic mountains that comprise the island. In Hawaiian, wahi a wā means "space of the wa people".
Lakes and reservoirs are rare in Hawaii, and Wahiawa is unique in being surrounded on three sides by Lake Wilson (also known as Wahiawa Reservoir or Kaukonahua). The town must be reached by either of two bridges on Kamehameha Highway (State Rte. 80) across the reservoir's narrow north and south arms. Outside of the reservoir, the town used to be surrounded by military bases and agricultural fields, but development is making its way up from the increasingly urbanised southern portion of the central plain. Still, there are significant U.S. Army facilities in the area, including Schofield Barracks, Wheeler Army Airfield, and East Range, an Army training area extending into the hills south and east of town. Schofield Barracks alone is larger than Wahiawa CDP. Wahiawa is also home to the United States Navy's Naval Computer and Telecommunications Area Master Station Pacific.
Wahiawa has a population of over 17,821 people.