Abstract: The genus Kobresia in Xizang (Tibet) is revised taxonomically on the basis of both herbarium and field observations. Thirty-six species and one subspecies are recognized. The names of six taxa are corrected, and the six correct names are K. esenbeckii, K. fissiglumis, K. gammiei, K. littledalei, K. myosuroides ssp. bistaminata and K. vaginosa. Thirteen previously recognised taxa, K. angusta, K. cercostachys var. capillacea, K. clarkeana, K. curticeps var. gyirongensis, K. deasyi, K. glaucifolia, K. hookeri, K. nudicarpa, K. prainii var. elliptica, K. seticulmis, K. stenocarpa, K. stenocarpa var. simplex and K. williamsii, are treated as synonyms. K. prainii var. elliptica, K. glaucifolia and K. stenocarpa var. simplex are new synonyms. K. handel-mazzettii is a new record to Xizang. Two species newly published, K. pseuduncinoides and K. woodii, should be added to the flora of Xizang. A new key to species and subspecies, and the information of the distribution sites of each taxon in Xizang are given.