Weinmannia marquesana F. Br. var. angustifolia Lorence & W. L. Wagner, var. nov., a new variety with narrow, simple leaves endemic to Tahuata, Marquesas Islands (French Polynesia) is described and its affinities and conservation status are discussed. It is similar to the other two varieties of this species bysimple leaves, but this new variety has much narrower leaf blades, and it resembles W. tremuloides innarrow leaf blades but differs bysimple, not trifoliolate leaves.