The Waiuku River, also known as the Waiuku Estuary, is an estuarial arm of the Manukau Harbour, near the town of Waiuku, south-west of Auckland. It joins the harbour at the south west and extends south for 12 kilometres (7 mi), having its head close to the town of Waiuku.

• 
  Buildings along the edge of the Waiuku River (circa 1911)
• 
  The Waiuku River at low tide in 2000
• 
  Southern end of the Waiuku River, as it meets the township of Waiuku