球兰（学名：Hoya carnosa）是夹竹桃科萝藦亚科球兰属的植物。虽名称中有「兰」，但与一般常见的兰花不同科。

卵形至卵状长圆形的肉质叶子对生；春季开白色花，聚伞花序，生于叶腋；线形蓇葖果。 一种美丽的室内观赏花，香味强烈而无毒。花蜜可食。

Hoya carnosa, the porcelainflower or wax plant, is an Asclepiad species in the dogbane family (Apocynaceae). It is one of the many species of Hoya that are native to Eastern Asia and Australia. It is a common house plant grown for its attractive waxy foliage, and sweetly scented flowers.