Aristolochia longlinensis Yan Liu & L. Wu, a new species from western Guangxi, China, is described and illustrated here. It is morphologically most similar to A. cucurbitoides C. F. Liang, with which it has been taxonomically confused in the past. However, the new species can be easily distinguished from the latter by the trumpet shape of its flower limb (vs. cylindrical shape in A. cucurbitoides), ca. 1.8 cm in diameter at the mouth (vs. 2–3 mm), lobes widely deltoid (vs. lanceolate), ca. 5 × 20–25 mm (vs. 5–7 × 2–3 mm).