La bilis de oso es una sustancia extraída de la de la vesícula biliar del oso del Himalaya u oso negro asiático. Esta sustancia es usada como remedio de la medicina china tradicional.

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Bile bears, sometimes called battery bears, are bears kept in captivity to harvest their bile, a digestive fluid produced by the liver and stored in the gallbladder, which is used by some traditional Chinese medicine practitioners. It is estimated that 12,000 bears are farmed for bile in China, South Korea, Laos, Vietnam, and Myanmar. The bear species most commonly farmed for bile is the Asiatic black bear (Ursus thibetanus), although the sun bear (Helarctos malayanus) and the brown bear (Ursus arctos) are also used. Both the Asiatic black bear and the sun bear are listed as Vulnerable on the Red List of Threatened Animals published by the International Union for Conservation of Nature. They were previously hunted for bile but factory farming has become common since hunting was banned in the 1980s. The bile can be harvested using several techniques, all of which require some degree of surgery, and may leave a permanent fistula or inserted catheter. A significant proportion of the bears die because of the stress of unskilled surgery or the infections which may occur. Farmed bile bears are housed continuously in small cages which often prevent them from standing or sitting upright, or from turning around. These highly restrictive cage systems and the low level of skilled husbandry can lead to a wide range of welfare concerns including physical injuries, pain, severe mental stress and muscle atrophy. Some bears are caught as cubs and may be kept in these conditions for over 20 years. Though the value of the bear products trade is estimated as high as $2 billion, there is no evidence that bear bile has any medicinal effect, and no plausible mechanism by which it might work. The practice of factory farming bears for bile has been extensively condemned, including by Chinese physicians.

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