Non Khun (Thai: โนนคูณ, pronounced [nōːn kʰūːn]) is a district (amphoe) in the eastern part of Sisaket province, northeastern Thailand.

Neighboring districts are (from the south clockwise): Benchalak, Nam Kliang, and Kanthararom of Sisaket Province, and Samrong of Ubon Ratchathani province.

Non Khun was created as a minor district (king amphoe) under Kanthararom district on 1 September 1977, with the tambons, Non Kho, Pho, Bok, and Nong Kung. It was upgraded to a full district on 1 January 1988.

The district is divided into five sub-districts (tambons), which are further subdivided into 80 villages (mubans). There are no municipal (thesaban) areas. There are five tambon administrative organizations (TAO).

No.	Name	Thai name	Villages	Pop.
1.	Non Kho	โนนค้อ	20	8,100
2.	Bok	บก	17	9,589
3.	Pho	โพธิ์	13	5,605
4.	Nong Kung	หนองกุง	18	9,606
5.	Lao Kwang	เหล่ากวาง	12	4,965

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