Osha or oshá (Ligusticum porteri) is a perennial herb found in parts of the Rocky Mountains and northern Mexico, especially in the southwestern United States.

Its common names include osha root, Porter's lovage, Porter's licorice-root, lovage, wild lovage, Porter's wild lovage, loveroot, Porter's ligusticum, bear medicine, bear root, Colorado cough root, Indian root, Indian parsley, wild parsley, mountain ginseng, mountain carrot, nipo, empress of the dark forest, chuchupate, chuchupati, chuchupaste, chuchupatle, guariaca, hierba del cochino or yerba de cochino, raíz del cochino, and washí (tarahumara). In the Jicarilla language, osha is called ha’ich’idéé. The White Mountain Apache call it ha 'il chii' gah.

Osha is strictly a mountain plant, and it is most commonly found in deep, moist soils rich in organic material. The plant requires partial shade. Osha is widely distributed from British Columbia south into Oregon and Washington, and throughout the Rocky Mountains and the high mountains of New Mexico. It is most common in the upper limits of the subalpine zone, so in the southern part of its range, it grows at elevations from 7,000 feet to 10,000 feet (2100 m to 3000 m), while from Utah, Wyoming, and Montana northwards, it grows as low as 5,000 feet (1500 m).