Mueang Nakhon Ratchasima (Thai: เมืองนครราชสีมา, pronounced [mɯ̄aŋ ná(ʔ).kʰɔ̄ːn râːt.tɕʰā.sǐː.māː]; Northeastern Thai: เมืองนครราชสีมา, pronounced [mɯ̄aŋ nà(ʔ).kʰɔ᷇ːn lâːt.sā.sǐː.ma᷇ː]) is one of 32 districts of Nakhon Ratchasima province, northeastern Thailand.

Nakhon Ratchasima was built in the reign of King Narai the Great of Ayutthaya kingdom.

Neighbouring districts are (from the north clockwise): Non Thai, Non Sung, Chaloem Phra Kiat, Chok Chai, Pak Thong Chai, Sung Noen, and Kham Thale So.

The City of Nakhon Ratchasima or Korat City, covers the area of Nai Mueang Sub-district (tambon) and parts of Ban Ko Sub-district.

And 17 Subdistrict Administrative Organizations (SAO): Ban Ko, Ban Mai, Ban Pho, Chai Mongkhon, Cho Ho, Maroeng, Muen Wai, Nong Bua Sala, Nong Chabok, Nong Krathum, Nong Rawiang, Phanao, Phon Krang, Phutsa, Si Num, Suranaree and Talat responsible for the non-municipal areas.