Jeongja-dong (Korean: 정자동) is a neighbourhood in the Bundang-gu district of Seongnam, Gyeonggi Province, South Korea. It is further subdivided into Jeongja 1-dong through Jeongja 3-dong.

It is well-known for its Café Street, which has a wide variety of restaurants and cafes. Naver Corporation and Korea Telecom are headquartered in the area. The Bundang Police Station [ko] is also here.

The area received its name during the mid-Joseon period, when a residence was created in the area for the ruling House of Yi. The name literally means "pavilion"; it received the name because the royal family created pavilions next to the banks of the stream Tancheon that passes through it.