Phichai (Thai: พิชัย, pronounced [pʰí.t͡ɕʰāj]) is the southernmost district (amphoe) of Uttaradit province, northern Thailand.

Neighboring districts are (from the north clockwise) Tron, Thong Saen Khan of Uttaradit Province, Wat Bot, Phrom Phiram of Phitsanulok province, Sawankhalok and Si Nakhon of Sukhothai province Mueang Phichai is believed to have been built in the 15th century on order of King Trailokanat as a frontier town fortified with a wall and moat.

However, almost no traces of this historic town survived, only the old chedi in Wat Nah Phrathat dates back to this time.

The district is divided into 11 sub-districts (tambon), which are further subdivided into 97 villages (muban).

This Uttaradit province location article is a stub.