Champasak is a province in southwestern Laos, near the borders with Thailand and Cambodia. It's best known for a series of Khmer ruins, collectively named a UNESCO World Heritage Site as the Champasak Cultural Landscape.

Champasak has played a central role in the history of Siam and Laos, with frequent battles taking place in and around Champasak. Its rich cultural heritage includes ancient temple ruins and French colonial architecture. Champasak has some 20 wats (temples), such as Wat Phou, Wat Luang, and Wat Tham Fai. Freshwater dolphins and the province's many waterfalls are tourist attractions.