木麻黄（学名：Casuarina equisetifolia）为木麻黄科木麻黄属的植物。

常绿乔木，高可达20米；灰绿色小枝细软，颇似针叶，多节，每节有极退化的苞片状叶6－8枚；初夏开花，雌雄同株或异株；球形果实，直径10－16毫米，小坚果，上部有翅。

Casuarina equisetifolia or Australian pine tree is a she-oak species of the genus Casuarina. The native range extends from Burma and Vietnam throughout Malaysia east to French Polynesia, New Caledonia, and Vanuatu, and south to Australia (north of Northern Territory, north and east Queensland, and north-eastern New South Wales). Populations are also found in Madagascar, but it is doubtful if this is within the native range of the species. The species has been introduced to the Southern United States and West Africa. It is an invasive species in Florida and South Africa.