Nikhom Nam Un (Thai: นิคมน้ำอูน, pronounced [ní(ʔ).kʰōm náːm ʔūːn]; Northeastern Thai: นิคมน้ำอูน, pronounced [nì(ʔ).kʰo᷇m nâːm ʔūːn]) is a district (amphoe) in the western part of Sakon Nakhon province, northeast Thailand.

Neighboring districts are (from the north clockwise) Waritchaphum, Phanna Nikhom and Kut Bak of Sakon Nakhon Province, and Wang Sam Mo of Udon Thani province.

[2] The district is divided into four sub-districts (tambons), which are further subdivided into 32 villages (mubans).

There are no municipal (thesaban) areas, and four tambon administrative organizations (TAO).

This Sakon Nakhon Province location article is a stub.