月见草（学名：Oenothera biennis）为柳叶菜科月见草属下的一个种。

Oenothera biennis (common evening-primrose, evening star, or sun drop) is a species of Oenothera native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions. Evening primrose oil is produced from the plant.