Bundang-gu (Korean: 분당구) is the largest and most populous district (gu) of Seongnam, a major city in the Seoul Capital Area, South Korea. Bundang-gu is one of South Korea's wealthiest and highest developed areas, being the nation's first and largest completely artificial city built in the early 1990s. Many high-rise luxury condos moved in the early 2000s, with a second planned city built in the late 2000s called Pangyo in the same district. Apartment prices are the second highest in Gyeonggi-do after Gwacheon and 7th highest nationwide, higher than many central Seoul districts such as Mapo-gu or Jongno-gu. Apartments around Pangyo station and the high-rise luxury condos around Jeongja station and Sunae station rival prices in the most expensive areas in the country. Unlike older cities such as Seoul, Bundang has no telephone poles overground, resulting in a clean cityscape with well-designed streets.

Seongnam is the fourth largest city in South Korea's Gyeonggi Province after Suwon and the 10th largest city in the country. Its population is approximately one million. Seongnam is a satellite city of Seoul. It is largely a residential city located immediately southeast of Seoul and belongs to the Seoul Capital Area.