Nakhon Champassak Province (also spelled Nakorn Champassak; Thai: นครจัมปาศักดิ์; RTGS: Nakhon Champasak) was a former province in Thailand established in 1941 following the annexation of territories of French Indochina.

Nakhon Champassak was one of the provinces created as a result of the Franco-Thai War when Vichy France agreed to cede Meluprey and Thala Barivat province from Cambodia and the cis-Mekong part of Champasak Province from Laos to Thailand.

[2] The two sections were merged to form Nakhon Champassak Province.

After World War II ended with the victory of the Allies, the post-war administration in France threatened to block Axis-aligned Thailand's admission into the newly formed UN.

Finally in 1946 this province was dissolved and returned to France.