Têwo County (; ) is a county in the south of Gansu province of China, bordering Sichuan province to the south. It is under the administration of the prefecture-level city of Gannan Prefecture. Its postal code is 747400, and in 1999 its population was 55,568 people.
The Lazikou Pass, a mountain pass of strategical significance during the Long March, is located in Têwo County.
Têwo County is divided to 5 towns and 6 townships.