Mangawhai is a township at the south-west extent of the Mangawhai Harbour, or Mangawhai Estuary, in Northland, New Zealand. The adjacent township of Mangawhai Heads is 5 km north-east, on the lower part of the harbour. Kaiwaka is 13 km south-west, and Waipu is 20 km north-west of Mangawhai Heads.