Eaton's pintail is a dabbling duck of the genus Anas. It is also known as the southern pintail. The species is restricted to the island groups of Kerguelen and Crozet in the southern Indian Ocean. It resembles a small female northern pintail. It was named after the English explorer and naturalist Alfred Edwin Eaton. It is threatened by introduced species, particularly feral cats, which prey on it, particularly during the post-breeding molt, when it is unable to fly.

The Crozet Islands are a sub-Antarctic archipelago of small islands in the southern Indian Ocean. They form one of the five administrative districts of the French Southern and Antarctic Lands.