Marine Mammal Sanctuaries can be established throughout New Zealand fisheries waters to create a permanent refuge for marine mammals. 

Such sanctuaries may prohibit activities known to harm particular marine mammal species, such as dolphins, whales, seals and sea lions. For example, a marine mammal sanctuary may not exclude all fishing activities, but may restrict what fishing methods may be used.

Under the Marine Mammals Protection Act 1978, the Department of Conservation is responsible for administering and managing marine mammal sanctuaries.