"Aristolochia yujungiana" C.T. Lu & J.C. Wang, a new species from Taiwan is described and illustrated. Compared to its congeners in Taiwan and neighboring areas, "A. yujungiana" is similar to "A. shimadae", "A. heterophylla", "A. kaempferi" and "A. liukiuensis". However, it can be differentiated from "A. shimadae" by the perianth color and shape, from "A. heterophylla" by the bracteole shape and limb surface, and from "A. kaempferi" and "A. liukiuensis" by the limb-lobe morphology and perianthtube shape. A morphological description, diagnosis, line drawings, photographs, and conservation status of "A. yujungiana" as well as a key and a comparison table to morphologically similar species are provided to aid in identification.