Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons.

A molecular phylogentic study comparing mitochondrial DNA sequences published in 2009 found that the genus Anas, as then defined, was not monophyletic.

[2] The genus Mareca was introduced by English naturalist James Francis Stephens in 1824.

[3][4] The name of the genus is from the Portuguese word Marreco for a small duck.

Cladogram based on the analysis of Gonzalez and colleagues published in 2009.