罗汉果（学名：siraitia grosvenorii），俗称“神仙果”，是葫芦科多年生藤本植物。其叶心形，雌雄异株，夏季开花，秋天结果。中医以其果实入药，含有罗汉果甜苷、多种氨基酸和维生素等药用成分，主治肺热痰火咳嗽、咽喉炎、扁桃体炎、急性胃炎、便秘等 ，罗汉果是中国广西桂林市著名特产“桂林三宝”之一。

罗汉果又称为甜味素，因其甜度非常高（蔗糖的300倍）、热量低而作为甜味剂广泛使用，常作为肥胖者和糖尿病患者的代用糖。

Siraitia grosvenorii (luo han guo or monk fruit) is a herbaceous perennial vine of the Cucurbitaceae (gourd) family, native to southern China and northern Thailand. The plant is cultivated for its fruit, whose extract is nearly 300 times sweeter than sugar and has been used in China as a natural low-calorie sweetener for cooling drinks, and in traditional Chinese medicine to treat diabetes and obesity.