Nong Wua So (Thai: หนองวัวซอ, pronounced [nɔ̌ːŋ wūa sɔ̄ː]; Northeastern Thai: หนองงัวซอ, pronounced [nɔ̌ːŋ ŋu᷇a sɔ᷇ː]) is a district (amphoe) in the western part of Udon Thani province, northeastern Thailand.

Neighboring districts are (from the north clockwise) Kut Chap, Mueang Udon Thani, and Nong Saeng of Udon Thani Province, Khao Suan Kwang of Khon Kaen province and Non Sang and Mueang Nongbua Lamphu of Nong Bua Lamphu province.

[1] It was upgraded to a full district on 1 April 1974.

[2] The district is divided into eight sub-districts (tambons), which are further subdivided into 78 villages (mubans).

This Udon Thani Province location article is a stub.