Khueang Nai (Thai: เขื่องใน, pronounced [kʰɯ̀aŋ nāj]; Northeastern Thai: เขื่องใน, pronounced [kʰɯ̄aŋ nâj]) is a district (amphoe) in the northwestern part of Ubon Ratchathani province, northeastern Thailand.

Neighboring districts are (from the east clockwise) Muang Sam Sip, Mueang Ubon Ratchathani of Ubon Ratchathani Province, Kanthararom, Yang Chum Noi of Sisaket province, Kho Wang, Maha Chana Chai, Kham Khuean Kaeo of Yasothon province and Hua Taphan of Amnat Charoen province.

[2] The district is divided into 18 sub-districts (tambons), which are further subdivided into 180 villages (mubans).

Khueang Nai is a sub-district municipality (thesaban tambon) which covers parts of tambon Khueang Nai.

This Ubon Ratchathani Province location article is a stub.