Rhododendron maddenii (隐脉杜鹃) is a rhododendron species native to Bhutan, northern India, northeast Myanmar, Sikkim, Thailand, northern Vietnam, and southwestern China, where it grows at altitudes of 2600–3200 meters. It is a shrub or small tree that grows to 3–6 m in height, with leathery leaves that are lanceolate, oblong-oblanceolate, or elliptic, 5–15 by 2–8 cm in size. Flowers are predominantly white.