Tha Sao (Thai: ท่าเสา) is a tambon (subdistrict) of Mueang Uttaradit District, in Uttaradit Province, Thailand.

In 2020 it had a total population of 14,691 people.

[1] The tambon is subdivided into 10 administrative villages (muban).

The area of the subdistrict is shared by 2 local governments.

This Uttaradit province location article is a stub.