灰颈鹭鸨（学名：Ardeotis kori），又称南非大鸨，是生活在非洲的一种大型鸟类，是可飞鸟中最重的一种之一。通常为灰色的身体，头顶为黑色，腿为黄色。

成年雄性灰颈鹭鸨平均110厘米长，60-90厘米高，翼展230至275厘米长，重12.4公斤。雌性在地面上筑巢并孵蛋，幼鸟孵出后喂流食。

The kori bustard (Ardeotis kori) is the largest flying bird native to Africa. It is a member of the bustard family, which all belong to the order Gruiformes and are restricted in distribution to the Old World. It is one of the four species (ranging from Africa to India to Australia) in the large-bodied Ardeotis genus. In fact, the male kori bustard may be the heaviest living animal capable of flight.