The Manawatū Estuary Trust is a charitable Trust that was formed in 2001 by members of The Royal Forest and Bird Protection Society of New Zealand, Inc. and The Ornithological Society of New Zealand. The Trust is dedicated to ensuring sustainable and wise management of the Manawatū Estuary, which is very important habitat for native wildlife. The Trust now has numerous members, including wildlife tour groups, schools, organisations and individuals.
The Manawatū Estuary Trust works closely with the Department of Conservation, Landcare Trust, Horizons Regional Council and Horowhenua District Council, which at the moment helps provide the Trust with technical expertise. The Manawatū Estuary Trust also has long standing relationships with academics from Massey University.
The Trust has accepted responsibility for carrying out various tasks, such as public education, advocacy, preparation of management plans, coordination between public authorities, interest groups and the community, fundraising and construction of information signs.