Helensville is a town in the North Island of New Zealand. It is sited 40 kilometres northwest of Auckland, close to the southern extremity of the Kaipara Harbour. State Highway 16 passes through the town, connecting it to Waimauku 16 km to the south, and Kaukapakapa about 12 km to the north-east. Parakai is 2 km to the north-west.