Abstract:Impatiens napoensis Y. L. Chen, previously known only from China, is newly found in Quan Ba District, Ha Giang Province, North Vietnam, and the vouchers are kept in the herbaria of Institute of Ecology and Biological Resources, Hanoi, Vietnam (HN) and South China Botanical Garden, Chinese Academy of Sciences (IBSC). Its morphological description, color photos, ecology and phenology are provided in this paper.