The Angsi Glacier or Nangser Glacier (Tibetan: ངང་སེར་འཁྱགས་རོམ, Wylie: ngang ser 'khyags rom, THL: ngang ser khyak rom) is a glacier located on the northern side of the Himalayas in the Purang County in China's Tibet Autonomous Region.

[1] It is immediately to the east of the Indus-Tsangpo water divide at the eastern edge of the Purang County.

[2] Swami Pranavananda, an Indian ascetic and pilgrim, noted in 1939 that the Tibetan traditions regard the Chema-yungdung glacier as the source of Brahmaputra.

Pranavananda also noted that the Indian Bhotiya merchants call the Tumulung Lake as "Brahmakund" and regard it as the source of Brahmaputra.

[6][7] Encyclopedia Britannica continues to regard the Chema-yungdung Glacier as the source of Brahmaputra.