Mueang Nong Khai (Thai: เมืองหนองคาย, pronounced [mɯ̄a̯ŋ nɔ̌ːŋ kʰāːj]) is the capital district (amphoe mueang) of Nong Khai province, northeastern Thailand.

To the north across the Mekong River is the Lao province Vientiane Prefecture.

The district is served by the Nong Khai railway station.

The district is divided into 16 sub-districts (tambons), which are further subdivided into 181 villages (mubans).

This Nong Khai Province location article is a stub.