The Tres Marías amazon (Amazona tresmariae ) is an Amazon parrot in the family Psittacidae. Many authorities consider it a subspecies of the yellow-headed amazon (Amazona oratrix ), including the American Ornithological Society, but is afforded full species status by the International Ornithological Congress. It is endemic to the Islas Marías off the Pacific coast of Mexico.
It has an all-yellow head, reaching to the foreneck and upper breast, and a yellow-tipped tail. It has white eyerings and orange-brown eyes. It has small red patches on its shoulders. Upperparts are paler green than Amazona oratrix and the underparts are blue-washed.
In aviculture, a variety of yellow-headed amazon known as "magna" exists, which has been selectively-bred to maximize the yellow coloration of the head. Magna birds closely resemble Tres Marías amazons.