Tha Faek (, ) is a tambon (sub-district) of Nam Pat District, in Uttaradit Province, Thailand. In 2014 it had a population of 4,434 people.
The sub-district originally was part of Tha Pla District. With the creation of the Sirikit Dam in 1972, the sub-district has become separated from the central part of Tha Pla District. Effective 14 February 2015, the sub-district was reassigned to Nam Pat District to make the authorities easier to reach for the local residents.
The sub-district is divided into nine administrative villages.
The entire sub-district is covered by the Tha Faek sub-district administrative organization (à ¸Âà ¸Âà ¸Âà ¹Âà ¸Âà ¸²à ¸£à ¸Âà ¸£à ¸´à ¸«à ¸²à ¸£à ¸ªà ¹Âà ¸§à ¸Âà ¸Âà ¸³à ¸Âà ¸¥à ¸Âà ¹Âà ¸²à ¹Âà ¸Âà ¸Â) as the local government unit, established in 1997.