Nathu La (Chinese: 乃堆拉山口; Nepali: नाथू ला, IAST: Nāthū Lā; ) is a mountain pass in the Himalayas. It is located on the Indo–China border connecting the Indian state of Sikkim with the Tibet Autonomous Region of the People's Republic of China. The pass, at 4,310 m (14,140 ft) above mean sea level, forms part of an offshoot of the ancient Silk Road. Nathu means "listening ears" and La means "pass" in Tibetan. It is also spelled Ntula, Natu La, Nathula, or Natula.

Nathu La is one of the three trading border posts between China and India; the other two are Shipkila in Himachal Pradesh and Lipulekh (or Lipulech) in Uttarakhand. Sealed by India after the 1962 Sino-Indian War, it was re-opened in 2006 following numerous bilateral trade agreements. The opening of the pass is expected to bolster the economy of the region and play a key role in the growing Sino-Indian trade. Currently, agreements between the two nations limit trade across the pass to the export of 29 types of goods from India and import of 15 from the Chinese side. The opening also shortens the travel distance to important Hindu and Buddhist pilgrimage sites in the region.