南方碱蓬（学名：Suaeda australis）是苋科碱蓬属的植物。分布在大洋洲、日本、**以及中国大陆的广东、广西、福建、江苏等地，多生于海滩沙地或红树林边缘。

Suaeda australis, the austral seablite, is a species of plant in the family Amaranthaceae, native to Australia. It grows to between 0.1 and 0.9 metres in height, with a spreading habit and branching occurring from the base. The leaves are up to 40 mm in length and are succulent, linear and flattened. They are light green to purplish-red in colour.