The Manawatu Estuary is an estuary at the mouth of the Manawatu River, near Foxton in the lower North Island of New Zealand. It is a wetland of international significance as one of the few Ramsar sites in New Zealand. At approximately 250 hectares, the Manawatu Estuary is the largest estuary in the lower North Island.
A total of 93 different bird species have been identified at the estuary. In 2005 the estuary attained Ramsar status.
- "Manawatu Estuary". The National Wetland Trust. Retrieved 5 February 2013.
- "Manawatu Estuary Management Plan: 2007-2012". Horizons Regional Council. Retrieved 5 February 2013.
- "Manawatu Estuary". Department of Conservation. Retrieved 5 February 2013.
- "Birsding Sites - Manawatu Estuary". New Zealand Birds Limited. Retrieved 6 February 2013.