Na Duang (Thai: นาด้วง; IPA: [nāː dûaŋ]) is a district (amphoe) in the eastern part of Loei province, northeastern Thailand.

The area of the district was originally Ban Na Duang of Udon Thani province, a village named after the hunter Duang.

Together with three more tambons it formed a minor district (king amphoe) on 17 January 1977.

[2] Neighboring districts are (from the south clockwise): Erawan, Mueang Loei, Pak Chom of Loei Province; Nam Som of Udon Thani province; and Suwannakhuha, Na Klang and Na Wang of Nong Bua Lamphu province.

The district is divided into four sub-districts (tambons), which are further subdivided into 41 villages (mubans).