Na Khu (Thai: นาคู, pronounced [nāː kʰūː]) is a district (amphoe) in the eastern part of Kalasin province, northeastern Thailand.

Neighboring districts are (from the south clockwise): Khao Wong, Kuchinarai, and Huai Phueng of Kalasin Province; Phu Phan and Tao Ngoi of Sakon Nakhon province; and Dong Luang of Mukdahan province.

[2] With publication in the Royal Gazette on 24 August, the upgrade became official.

[3] The district is divided into five sub-districts (tambons), which are further subdivided into 54 villages (mubans).

This Kalasin Province location article is a stub.