鸭科在鸟类传统分类系统中是鸟纲，雁形目中的一个科，包括鸭、雁、天鹅等常见鸟类。鸭科动物都能游泳和飞。有明显的颈部。

The Anatidae are the biological family of birds that includes ducks, geese and swans. The family has a cosmopolitan distribution, occurring on all the world's continents. These are birds that are adapted for swimming, floating on the water surface, and in some cases diving in at least shallow water. The family contains around 146 species in 40 genera. (The magpie goose is no longer considered to be part of the Anatidae, but is placed in its own family Anseranatidae.)