Fregata magnificens, commonly known as the Magnificent Frigatebird, is native to the tropical and subtropical regions of the Americas. Its geographical distribution extends along the Pacific and Atlantic coasts, including the Galápagos Islands, the Caribbean, parts of the Gulf of Mexico, and the western coast of Africa.

The Magnificent Frigatebird typically inhabits coastal environments and islands. It prefers tropical and subtropical climates, where the temperatures remain warm year-round. These birds are often found nesting in trees or shrubs on islands or along coastal cliffs.

Fregata magnificens is primarily a pelagic seabird, spending much of its time flying over the ocean. Its ecological niche involves aerial feeding strategies, often catching flying fish and other small marine creatures. It is known for kleptoparasitism, a behavior where it steals food from other birds. The species' ability to traverse vast oceanic distances aids in its role as a wide-ranging scavenger.