Rhododendron cinnabarinum (朱砂杜鹃) is a rhododendron species native to eastern Nepal, Bhutan, Sikkim, southeastern Tibet, and southwest China, where it grows at altitudes of 1900–4000 meters. It is a shrub that grows to 1–3 m in height, with leathery leaves that are broadly elliptic, oblong-elliptic to oblong-lanceolate or ovate, 3–6 by 1.5–2.5 cm in size. Flowers are yellow to cinnabar red, sometimes ranging to plum colors.