昙花属（学名：Epiphyllum；英语发音：/ˌɛpɨˈfɪləm/）是仙人掌科柱状仙人掌亚科的一种植物，包括有19个物种，原生于中美洲。

昙花属的学名 Epiphyllum 是由 epi 和 phyllum 两个希腊字根组成，意思就是叶片之上。

Epiphyllum (/ˌɛpᵻˈfɪləm/; "upon the leaf" in Greek) is a genus of 19 species of epiphytic plants in the cactus family (Cactaceae), native to Central America. Common names for these species include climbing cacti, orchid cacti and leaf cacti, though the latter also refers to the genus Pereskia.