Nakhon Ratchasima, city, northeastern Thailand, in the southwestern portion of the Khorat Plateau. Nakhon Ratchasima is the largest city and is the transportation, commercial, financial, and governmental centre of northeastern Thailand. A major railway connects the city to Bangkok, and the city is also linked to Bangkok and other Thai cities by air and highway. A network of roads stretches to every part of the region from the city, which is a busy commercial centre and a collecting point for rice and livestock. Nakhon Ratchasima grew rapidly during the 1960s and ’70s with the buildup of its Royal Thai Air Force Base, from which American planes operated during the Vietnam War. The city’s educational facilities include the Northeastern Technical Institute. Silk is produced in nearby villages. Rice, corn (maize), and tobacco are grown in the surrounding area, much of which is devoted to raising cattle and pigs.

The restored 11th-century Khmer temples at nearby Phimai (Pimai), similar in style to those of Angkor Wat in Cambodia, are a major tourist attraction of northeastern Thailand. Pop. (2000) 204,641.