List of mammals of the United States Minor Outlying Islands

This is a list of the mammal species recorded in the United States Minor Outlying Islands. There are five mammal species in the United States Minor Outlying Islands, all of which are marine mammals.
The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature:
Order: Cetacea (whales).
The order Cetacea includes whales, dolphins and porpoises. They are the mammals most fully adapted to aquatic life with a spindle-shaped nearly hairless body, protected by a thick layer of blubber, and forelimbs and tail modified to provide propulsion underwater.