According to Mabberley (2008), the genus Fraxinus L. has about 60 species mostly in temperate regions and subtropics of the Northern Hemisphere. In Vietnam, there are 4 species and 2 subspecies. After studying documents and specimen, the authors would like to introduce new occurrence species for the flora of Vietnam: Fraxinus styfosa. The voucher specimens (No DKH 5161, HN) were collected in Ha Giang province (Quan Ba district. Bat Dai Son Natural Reserver). Fraxinus styfosa closes to Fraxinus griffithii but differ by leaf has 3-5 leaflets, leaflet blade ovatelanceolate, ca. 3.5-8 x 0.8-2cm, flower unisexual.