Kumbum Monastery (Tibetan: སྐུ་འབུམ་བྱམས་པ་གླིང།, Wylie: sKu-'bum Byams-pa gling; also known as Ta'ersi, Chinese: 塔尔寺) is a Buddhist monastery in Qinghai province, China. Kumbum was founded in 1583 in a narrow valley close to the village of Lusar in the Tibetan cultural region of Amdo. Its superior monastery is Drepung, immediately to the west of Lhasa. It was ranked in importance as second only to Lhasa.

Alexandra David-Neel, the famous French explorer who spent more than two years studying and translating Tibetan books at the monastery, said of it that "the configuration of the surrounding mountain ranges arrested the passage of the clouds, and forced them to turn around the rocky summit which supported the gompa forming a sea of white mist, with its waves beating silently against the cells of the monks, wreathing the wooded slopes and creating a thousand fanciful landscapes as they rolled by. Terrible hailstorms would often break over the monastery, due, said the country folk, to the malignity of the demons who sought to disturb the peace of the saintly monks."