Bua Yai บัวใหญ่
District
Bua Yai Junction railway station
District location in Nakhon Ratchasima province
Coordinates: 15°34′59″N 102°25′23″E / 15.58306°N 102.42306°E / 15.58306; 102.42306
Country	Thailand
Province	Nakhon Ratchasima
Seat	Bua Yai
Area
• Total	271.6 km2 (104.9 sq mi)
Population  (2000)
• Total	86,776
• Density	319.5/km2 (828/sq mi)
Time zone	UTC+7 (ICT)
Postal code	30120
Geocode	3012

Bua Yai (Thai: บัวใหญ่, pronounced [būa jàj], Northeastern Thai: บัวใหญ่, pronounced [būa ɲāj]) is a district (amphoe) in the northern part of Nakhon Ratchasima province, northern central Thailand.

Bua Yai dates back to the frontier town called Dan Nok (ด่านนอก). The center of the town was Ban Nong Lang Yai. In 1868, it was upgraded to Dan Nok District and the town center was moved to Ban Nong Lang Noi. The district office was moved again to Ban Bua Yai in 1905, and the district was renamed accordingly. The office was three kilometers from the Bua Yai railway junction. The presence of the railway spurred development of the village Ban Fat Fueay which became the new site of the district office in 1951.

Neighbouring districts are (from the north clockwise): Waeng Noi of Khon Kaen province; Bua Lai, Sida, Non Daeng, Khong, Ban Lueam, and Kaeng Sanam Nang of Nakhon Ratchasima Province.

The district is divided into 10 sub-districts (tambons). The town (thesaban mueang) of Bua Yai covers part of tambon Bua Yai.

The missing numbers are tambons which now form the districts Kaeng Sanam Nang, Sida, and Bua Lai.