Na Chaluai (Thai: นาจะหลวย, pronounced [nāː tɕā.lǔaj]; Northeastern Thai: นาจะหลวย, pronounced [na᷇ː tɕā.lǔaj]) is a district (amphoe) in the southern part of Ubon Ratchathani province, northeastern Thailand.

The Ministry of Interior created the "minor district" (king amphoe) Na Chaluai on 1 February 1972, when the three tambons (sub-districts) Na Chaluai, Phon Sawan, and Non Sombun were split off from Det Udom district. The sub-district was later upgraded to a full district on 12 April 1977.

More than 80 percent of Na Chaluai's people moved there from other districts. This area was a battle field of Communist Party of Thailand and the Royal Thai Army during the time of Vietnam War.

Neighboring districts are (from the west clockwise) Nam Yuen, Det Udom, Buntharik and the Laotian province of Champasak.

Phu Chong-Na Yoi National Park is in the district. The important water resource is the Dom Yai river.

The district is divided into six sub-districts (tambons), which are further subdivided into 68 villages (mubans). Na Chaluai is a township (thesaban tambon) which covers parts of tambon Na Chaluai. There are a further six tambon administrative organizations.

No.	Name	Thai name	Villages	Pop.
1.	Na Chaluai	นาจะหลวย	16	17,057
2.	Non Sombun	โนนสมบูรณ์	9	6,600
3.	Phon Sawan	พรสวรรค์	10	5,440
4.	Ban Tum	บ้านตูม	14	11,998
5.	Sok Saeng	โสกแสง	10	7,251
6.	Non Sawan	โนนสวรรค์	9	5,428

• amphoe.com
• Phu Chong Na Yoi National Park